Polycom EF1210 User Manual

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CHOFREE

™ EF1210 M

ULTI

COUSTIC

CHO AND

ANCELLER

SER

-C

HANNEL

OISE

ANUAL

Copyright © 1999 ASPI Digital. All rights reserved. Printed in the United States of America. Because of technical progress, specifications are subject to change without notice. EchoFree is a trademark and ASPI is a registered trademark of ASPI Digital.

ASPI Digital - The Sound of DSP 1720 Peachtree Street NW, Suite 220 Atlanta, GA 30309-2439 (404) 892-3200 www.echofree.com

Technical Support: (404) 892-3200 help@aspi.com

EF1210UM-0100-99

EF1210 U

SER MANUAL

Introduction....................................................................................................3

Product Features.................................................................................................... 4

Quick Installation...........................................................................................6

Hardware Installation ............................................................................................ 6

Calibration.............................................................................................................. 6

EF1210 Calibration Quick Reference.................................................................... 8

Advanced Installation ....................................................................................10

Preparing for Installation....................................................................................... 10

EF1210 Front and Rear Panels..............................................................................12

Configuration.......................................................................................................... 15

Connecting the EF1210 to other equipment........................................................... 19

Calibration.............................................................................................................. 27

Calibrating With a Computer................................................................................. 28

Calibrating Without a Computer............................................................................ 28

Calibration Step 1: Calibrating Microphone Input Channels................................29

Calibration Step 2: Calibrating Zone Outputs....................................................... 30

Calibration Step 3: Calibrating AEC Reference Inputs.........................................32

Calibration Step 4: Calibrating for Playback and Record.....................................33

Calibration Step 5: Zone/Reference Setup............................................................. 34

Mounting the EF1210.............................................. ............................................... 36

Operating the EF1210....................................................................................38

Using the EF1210 Without RS-232 Control...........................................................38

Using the EF1210 With RS-232 Control................................................................39

Troubleshooting.............................................................................................42

No Output to Loudspeakers in Zone.......................................................................42

No Output to Remote End....................................................................................... 42

Residual Echo......................................................................................................... 44

Remote Control Problems.......................................................................................47

Contacting Technical Support................................................................................ 48

Technical Specifications................................................................................49

Compliance.............................................................................................................49

Warranty Information ....................................................................................51

EF1210 Command Set Reference..................................................................53

Command Syntax.................................................................................................... 53

Valid Commands and Messages............................................................................. 55

Default Values and Saved Parameter List.............................................................. 84

Applications...................................................................................................85

Distance Learning .................................................................................................. 85

Courtrooms............................................................................................................. 86

Further Assistance..................................................................................................86

EF1210 Block Diagram .................................................................................87

Connector Pinouts..........................................................................................88

Connecting Balanced Equipment to Unbalanced Equipment........................90

Connecting Unbalanced RCA to Balanced Mini Phoenix......................................90

Appendix A: EFPanel Control Software User Manual

About EFPanel Control Software ..................................................................A-3

Installing EFPanel.................................................................................................. A-3

Getting Started......................................................... ............................................... A-3

EFPanel Features for all EF Devices.................................................................... A-3

The EF1210 Options Page.............................................................................A-5

EF1210 U

SER MANUAL

RELIMINARY

Calibrating the EF1210 with EFPanel Control Software...............................A-7

Calibration Step 1: Calibrating Microphone Input Channels................................ A-7

Calibration Step 2: Calibrating Zone Outputs....................................................... A-9

Calibration Step 3: Calibrating AEC Reference Inputs.........................................A-11

Calibration Step 4: Calibrating for Playback and Record.....................................A-13

Calibration Step 5: Zone/Reference Setup............................................................. A-14

Save Setup Settings................................................................................................. A-15

EFPanel for the EF200 Phone Add................................................................A-17

Dialer...................................................................................................................... A-17

Phone Book............................................................................................................. A-18

EF200 Options........................................................................................................A-19

Technical Support: 404.892.3200

NTRODUCTION

Congratulations!

How to Use This Manual

Congratulations on your purchase of the EchoFree™ EF1210 Multi-Channel Acoustic Echo and Noise Canceller. By choosing AS PI Digital’s Ec hoFree™ products , you are investing in cutting edge DSP technology that will help provide the best po ssible audio quality for your system.

This manual is a reference manual for your EF1210. It is structured to provide the information you need quickly and conveniently. The following is an overview of each section:

• Quick Installation gives an overview of the installation process including an outline of hardware installation as well as calibration of the EF1210. It also includes a quick reference for calibration — use the quick reference only if you are very familiar with the EF1210 since it is just an outline of steps without detailed explanations.

• Advanced Installation gives more detailed technical information on the installation, configuration and calibration of the EF1210.

• Operating the EF1210 outlines using the EF1210 with and without RS-23 2 control.

• Troubleshooting helps to debug problems with installation.

• Technical Specifications provides the technical specifications of the EF1210.

• Warranty Information

• EF1210 Command Set Reference contains instructions on how to send RS-232

commands to the EF1210 as well as a reference of the RS-232 commands.

• Applications briefly describes using the EF1210 in different applications.

• EF1210 Block Diagram

• Connector Pinouts

• Connecting Balanced Equipment to Unbalanced Equipment

Product Descripti on

ASPI Digital -

The Sound of DSP

The EF1210 Multi-Channel Acoustic Echo and Noise Canceller installs between the room’s microphones and the automatic mixing system, providing individual channel noise cancellation and acoustic echo cancellation. The EF1210 works with most vendors’ automixing systems to provide conferencing capability to new and existing rooms.

Unlike most echo cancellers, the EF1210 requires no training sequence to learn a room’s echo response. After the unit has been installed, all you have to do is turn it on. No further adjustments are required. ASPI’s echo cancellation algorithm offers speed, flexibility and superior audio quality to your conference room setup.

The speed at which an echo canceller matches the actual sound of a room (the convergence rate) is a direct indication of the product’s quality. Faster convergence allows better conference quality by instantly adapting to chan ging room environments such as moving microphones, changing volumes or people moving around the room. Our echo cancellers are designed to provide faster convergence and better performance than other echo cancellers. This means that the EF1210 adapts to changes in room acoustics during conversations quickly for consistent performance throughout the

Technical Support: 404.892.3200 3

EF1210 U

conversation. At a convergence rate of 30 dB per second, ASPI echo cancellers are the fastest on the market.

Because the EF1210 supports a wider range of acoustic gain than most echo cancellers, it offers greater flexibility in loudspeaker and microphone placem ent. Most echo cancellers can only operate properly at less than 0 dB of acoustic gain. Breaking through this threshold can cause echoes and howli ng as loudspeak er levels overpower the microphones. Th at can leav e you with f ew options when desig ning audi o or vide o conference rooms. A wider range of acoustic gain results in a smaller danger zone, allowing the Systems Designer greater flexibility when placing loudspeakers and microphones or setting volume levels.

ASPI’s superior audio quality allows all parties to communicate freely and naturally, without echoes, switching noises, clipping of words, or dropout of speech. A patented state-logic algorithm ensures smooth and natural communications without typical speakerphone performance problems.

ASPI’s proprietary noise cancellation on each of the inp uts helps to keep overall noise to a minimum. ASPI echo cancellers are the only ones on the market to feature this patent pending technology. Noise cancellation filters out ambient background noise such as HVAC, LCD projectors, and road noise. Our noise cancellation technology is not a noise gate. It actually removes noise. Therefore, it enhances the operation and improves the sound quality of an automixer, for example, by pre venting it from bringing the noise level up and down when microphones are gated on and off. By cancelling the noise picked up by each microphone, the overall SNR is preserved. The result is crystal clear speech over a greater decibel range than any other echo canceller. That means reduced listener fatigue and a higher quality audio conference.

SER MANUAL

Warranty Registration

RODUCT FEATURES

The EF1210 is also fully RS-232 controllable via all popular room control systems, and provides links to other ASPI products, such as the EF200 Phone Add.

Please take a moment to fill out and return your warranty registration card. This information will help us to provide you with better customer support.

• 8 microphone/line level inputs

• Phantom power on each input

• Ambient noise cancellation (patent pending) on each input

• Fast convergence rate of 30 dB/sec

• Works in environments with up to 10 dB of room gain

• Links to other ASPI devices such as EF200 Phone Add

• Compatible with most matrix and automixers

• Fully RS-232 controllable via room controllers

• Front panel lock-out capability

• Can be used as a wideband noise cancell er (20 kHz band width) when AEC i s disabled

• Long “Tail Time” supports even the most difficult of rooms (200 ms)

• Supports up to two AEC reference input signals

• Supports record and playback

• Ability to store user configurations in non-volatile memory

• Digitally controlled analog trimpots

• Phoenix connectors for audio input and output

• Single rack unit width and height

NTRODUCTION

• Pink noise generator for calibration mode

• 2 year warranty

ASPI Digital -

The Sound of DSP

Technical Support: 404.892.3200 5

UICK INSTALLATION

ARDWARE INSTALLATION

EF1210 U

Installation of the EF1210 involves two procedures: hardware installation, and calibration.

Hardware installation involves the following steps:

1. Set rear panel DIP switches to select Line or Mic level and enable phantom power for each microphone input channel, and to select ASPI Bus Device ID if necessary. See “Configuration” on page 15.

2. Connect input and output signals (See “Connecting the EF1210 to other equipment” on page 19):

• Connect the 8 Mic/Line Inputs to microphones.

• Connect the 8 Line Outputs to the inputs of a mixer.

• Turn off Phantom Power on automixer.

• Connect Zone Output(s) to amplifier(s) or powered loudspeaker(s).

• Connect AEC Reference Inputs to the T

output of a CODEC.

• If you wish to use the EF1210’s bu ilt in P layback/ Record mixer feature, con-

nect A Record” on page 22.

3. If you are using an RS232 remote control device, connect it to the RS-232 R

EMOTE CONTROL

them using the ASPI Bus ports (See “Connecting the ASPI Bus” on page 26).

4. Connect the external power supply.

, AUX IN, TO CODEC, and REC as directed in “Playback/

MIX IN

port; if you are controlling multiple ASPI devices, connect

AEC output of an EF200 or to the

SER MANUAL

ALIBRATION

Caution!

Calibration of the EF1210 involves a sequence of five calibration steps to configure the input and output levels of the EF1210 to match those of the equipment to which it is connected. The EF1210 can be calibrated either from the front panel or by using a computer. Please refer to “Calibration” on page 27 for more detailed information on the Calibration procedure. Correct calibration is essential for satisfactory operation of the EF1210, so please take the time to familiarize yourself with the details of the Calibration procedure by reading “Calibrati on” on page 27.

For front panel calibration, enter Calibration mode by pressing and holding the A I

N LEVEL/SETUP

mode, the S executing. Press the A to the next. When you have finished Calibration step 5, press the A

button again to exit Calibration mode; any changes that you made will be

ETUP

saved as the default power-on settings when you exit the Calibration procedure.

The EF1210 is designed to maintain a 1/4” (6.35 mm) air circulation clearance above the enclosure. Do not stack or install

EF1210s in such a way as to defeat this clearance, block the side vent holes, or otherwise impe de air circulation around the EF1210.

and I

NPUT SELECT

LED will blink to let you know which setup step you are currently

ETUP

UX IN LEVEL/SETUP

front panel buttons for 2 seconds. In Calibration

button to move from one Calibration step

UX IN LEVEL

UICK INSTALLATION

If you miss a Calibration step or lose your place and get to the wrong C alibration step, you may either continue and come back to the missed step later or exit Calibration mode (by pressing A

UX IN LEVEL/SETUP

repeatedly until the S

LED is no longer

ETUP

illuminated), re-enter Calibration mode, and resume Calibrat ion at the step that you missed. If you wi sh t o ex it Cal ibration mode and discard any changes that you made, you must cycle power on the EF1210 before exiting Calibration mode.

ASPI Digital -

The Sound of DSP

Technical Support: 404.892.3200 7

EF1210 U

SER MANUAL

EF1210 C

Legend:

ALIBRATION QUICK REFERENCE

LED Off LED On Button

LED Blinking

Calibration Step 1: Calibrating Microphone Input Channels

1.1. Press and hold the AUX IN LEVEL/SETUP and the INPUT SELECT buttons for 2 seconds to enter setup. SETUP LED blinks once per period.

1.2. Press REF SELECT to select noise output source.

1.3. Press INPUT SELECT to select input channel to calibrate.

1.4. Place SPL meter beside mic pointing in the same direction. Adjust loudspeaker for 73 dB SPL at mic (for boundary mics) or refer to Table 4 in Calibration Section for other mic types.

1.5. Press LEVEL ADJUST until first yellow LED (0 dB) on INPUT meter is lit on INPUT meter.

1.6. Repeat steps 3-5 for each input channel. Be sure to move SPL meter or mics so each mic sees the appropriate SPL level.

: adjust

reen

MUTE

ALL

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

STEP 1.5

level until 3

and 1 yellow LEDs

are lit (repeat for

each channel)

STEP 1.1

hold AUX IN LEVEL/

SETUP button

INPUT SELECT for 2

seconds to enter

confi

LEVEL

ADJUST

: Press and

and

uration mode

AUX IN

LEVEL

SETUP

STEP 1.2

select noise source

REF

SELECT

Calibration Step 2: Calibrating Zone Outputs, Check Acoustic Gain

STEP 1.3

press to select

channel for

calibration

INPUT

SELECT

: press to

LED blinks

once for

microphone

calibration

AECAAEC

SETUP

LEDs light to

indicate which

channel is selected

12345678

pink noise to both zones no noise

enerated

pink noise to zone A pink noise to zone B

noise level

measured

at mic

should be

73 dB SPL,

or refer to

Table 4

2.1. Press the AUX IN LEVEL/SETUP button to enter Zone Output Calibration. SETUP LED blinks twice per period.

2.2. Press REF SELECT to select noise output source (we recommend using both zones simultaneously).

2.3. Select nominal output level for your room audio amplifier with LEVEL ADJUST (press UP for 0 dBu, DOWN for -10dBV).

2.4. Repeat for other Zone output if appropriate. Then return all mics to their operating position and orientation.

2.5. Check acoustic gain limit. Adjust external amplifiers/loudspeakers so that the loudspeaker volume is almost uncomfortably loud OR no more than 3 green LEDs are lit on INPUT meter.

2.6. Press INPUT SELECT to select next input channel.

2.7. If INPUT meter shows more than 3 green LEDs, turn down room amplifier.

2.8. Repeat steps 6 & 7 for each input channel.

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

STEP 2.7

amplifiers/loudspeakers so that no more than 3

: adjust external

lit (repeat for each channel)

reen LEDs are

MUTE

ALL

STEP 2.3a

: press

if amp expects consumer level input (-10 dBV)

LEVEL

ADJUST

STEP 2.3b

if amp

press

expects 0 dBu

balanced input

STEP 2.6

to select channel;

AUX IN

REF

LEVEL

SELECT

SETUP

STEP 2.2

press to select

noise source

: press

check level

INPUT

SELECT

LED blinks

twice for Zone

calibration

AECAAEC

SETUP

channel is selected

12345678

noise to both zones (recommended) noise to zone A noise to zone B

LEDs light to

indicate which

UICK INSTALLATION

Calibration Step 3: Calibrating AEC Reference Input

3.1. Press AUX IN LEVEL/SETUP button again to enter Ref Input calibration. The SETUP LED blinks 3 times per period.

3.2. Press REF SELECT to select input source (AEC A or AEC B). Single zone installation will use AEC A.

3.3. Establish live connection to remote site(s) and have remote party talk normally.

3.4. Press LEVEL ADJUST until first yellow LED on REMOTE meter is flickering regularly and 2nd yellow is flickering rarely.

3.5. Repeat for other reference input if neccessary.

LED blinks three

times for AEC

Reference calibration

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

STEP 3.4

level until person

talking at remote site flickers second

MUTE

ALL

: adjust

yellow LED

LEVEL

ADJUST

AUX IN

REF

LEVEL

SELECT

SETUP

STEP 3.2

: press

to select

reference input

source

INPUT

SELECT

SETUP

AECAAEC

12345678

AEC A input selected AEC B input selected

Calibration Step 4: Calibrating for Playback and Record

4.1. Press the AUX IN LEVEL/SETUP button to enter Playback/Record calibration. The SETUP LED blinks 4 times per period. This step may be omitted if you are not using the internal EF1210 mixers to implement playback and record.

4.2. Press LEVEL ADJUST DOWN to set CODEC OUT level to -10 dBV, press LEVEL ADJUST UP to set CODEC OUT level to 0 dBu.

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

press Ð to set

CODEC OUT

MUTE

ALL

STEP 4.2a

level to -10

dBV

LEVEL

ADJUST

STEP 4.2b

press Ï to set

CODEC OUT level to 0 dBu

AUX IN

REF

SELECT

INPUT

SELECT

LED blinks four times for record

LEVEL

SETUP

AECAAEC

SETUP

and playback

calibration

12345678

Calibration Step 5: Zone/Reference Setup

5.1. Press the AUX IN LEVEL/SETUP button to enter Zone/Reference Setup. The SETUP LED blinks 5 times per period. This step may be omitted for single zone installations.

5.2. Use INPUT SELECT to cycle through each input channel. Use REF SELECT to select corresponding reference input for each input channel.

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

MUTE

ALL

LEVEL

ADJUST

STEP 5.2a

: press to

select channel for

calibration

AUX IN

REF

SELECT

: press to

INPUT

SELECT

LEVEL

SETUP

STEP 5.2b

select reference zone

LED blinks

five times for

zone/ref setup

AECAAEC

SETUP

LEDs light to

indicate which

channel is selected

12345678

zone A selected zone B selected

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 9

DVANCED INSTALLATION

The installation procedure for the EF1210 consists of the following steps:

1. Prepare for installation (below).

2. Configure the DIP switches to accept appropriate levels from microphones or mixer (See “Configuration” on page 15).

3. Connect the EF1210 to other equipment (See “Connecting the EF1210 to other equipment” on page 19).

4. Calibrate the EF1210 (See “Calibration” on page 27).

REPARING FOR INSTALLATION

Reading the entire manual (or at least the advanced installation section) before beginning the installation process will he lp you be more prepared for installation. Also, please make sure you have the correct equipment (outlined below) before you begin installation.

EF1210 U

SER MANUAL

What’s Included

What’s Not Included

Tools Needed

The EF1210 product package includes the following items:

• EF1210 User Manual (this manual)

• EF1210 MultiChannel Acoustic Echo and Noise Canceller

• External Power Supply with a cable clamp for strain relief

• Diskette with EFPanel Control Software

• Warranty R egistration Card

The following equipment is not included with the EF1210 product package, but may be necessary to create a completely functional system:

• Microphones

• Loudspeakers

• Audio amplifier (or amplified loudspeaker)

• EchoFree™

• Automatic microphone mixer or matrix mixer

• Audio cables

• Videoconferencing CODEC or other four-wire interface (optional)

• RS-232 remote control device (optional)

• Sound Level Meter (SPL meter)

• Screwdriver to mount EF1210 in your rack

EF200 Phone Add (see Note below)

DVANCED INSTALLATION

Note.

The EchoFree™

EF200 Phone Add provides a full duplex inter-

face between a four-wire audio system and a two-wire telephone line. It allows a telephone caller to be brought in to any four-wire audio system. The EF200 is similar to a digital hybrid, but with many more features and capabilities. The primary fu nction of the EF200 is the line echo canceller (LEC), which digitally eliminates reflections from the telephone hybrid. The EF200 is the recommended Phone Add for any application.

ASPI Digital -

The Sound of DSP

Technical Support: 404.892.3200 11

EF1210 U

SER MANUAL

EF1210 F

RONT AND REAR PANELS

S O U N D O F D S

T H E

POWER

INPUT REMOTE

-12 -7 -3 0 3 20 -12 -7 -3 0 3 20dB

1 2 3 4 5 6 7 8 9 10 11 12

HANTOM

ESERVEDRESERVED

ASPI BUS IN

PIN 2: TXD

ASPI BUS OUT

3: RXD

REMOTE CONTROLREMOTE CONTROL

RS-232

ID 8

ID 4

ID 2

ID 1

ID 16

EVICE

5-8

HANTOM

INELINELINELINELINE

13 14 15 16 18 19 20 21 22 23 24 25 26 27 2817

MUTE

ALL

Figure 1. EF1210 Front and Rear Panels

1. P

2. I

3. R

4. M

5. L

6. A

7. R

8. I

9. S

10. AEC A LED. During normal operation, this LED indicates if reference input A

11. AEC B LED. During normal operation, this LED indicates if reference input B

12. I

13. D

CHOFREE

INPUT

REF

AUX IN

SELECT

LEVEL ADJUST

5, 15 VDC 5, 15 VDC

436587

OWER INDICATOR

MIC/LINE INPUTS

LEVEL

SETUP

AEC REF

AUXINAMIX

. When the LED is green, power is on.

NPUT SIGNAL LEVEL INDICATOR

mic input signals (selected by I

EMOTE SIGNAL LEVEL INDICATOR

reference signals (selected by R

UTE ALL

LED. This LED is only ON when all 8 L

AEC A AEC B 12345678

SETUP

AEC BAEC A 21436587 REC

INPUT CHANNELS

LINE OUTPUTS

. Indicates level activity on any one of the 8

NPUT SELECT

button).

. Indicates level activity on either of the two

EF SELECT

button).

EF1210

ZONE

CODEC

INE OUTPUT

channels are

muted. If only some of the channels are muted, the LED will not be ON.

EVEL ADJUST

. Adjusts digital trimpot levels for the 8 microphone inputs, 2 reference inputs, 2 zone outputs, CODEC output, and Aux input (used in conjunction with the A

UX IN LEVEL/SETUP

. Press and hold both this button and the I

button).

NPUT SELECT

button for 2 seconds to put the EF1210 into configuration mode. Pressing the A

UX IN LEVEL/SETUP

calibration process. During normal operation, press and hold the A

button and use the L

ETUP

button again selects between configuration modes in the

UX IN LEVEL

EVEL ADJUST

buttons to adjust the playback leve l of

your program audio device.

EF SELECT BUTTON

ence input (AEC A or AEC B) is shown on the R

. During norma l operation, this button selects which refer-

EMOTE LEVEL INDICATOR

. Dur-

ing setup, it has different functions depending on the setup step.

NPUT SELECT BUTTON

of the 8 M

input channels is shown on the I

(LED meter). It is also used with the A

. During normal operation, this button selects which one

NPUT SIGNAL LEVEL INDICATOR

UX IN LEVEL/SETUP

button to enter se tu p

mode. During setup, it has different functions depending on the setup step.

LED. Flashes to indicate the current setup step. This LED is OFF during

ETUP

normal operation.

(AEC A) is selected for display on the R

EMOTE LEVEL INDICATOR

. During

setup, it has different functions depending on the setup step.

(AEC B) is selected for display on the R

EMOTE LEVEL INDICATOR

. During setup,

it has different f unctions depending on the setup st ep.

NPUT CHANNEL

input channel is selected for display on the I

LEDS. During normal operation, these LEDs indicate which

NPUT LEVEL INDICATOR

. During

setup, it has different functions depending on the setup step.

IP SWITCHES

. Select mic or line level inputs, phantom power, and ASPI Bus

ID.

DVANCED INSTALLATION

14. ASPI BUS IN. Connects to the ASPI BUS OUT of another ASPI Digital device.

15. ASPI B

US OUT

16. RS-232 R

. Connects to the ASPI BUS IN of another ASPI Digital device.

EMOTE CONTROL PORT

. Connect this to an optional RS-232 remote

control device, such as a touch panel or personal computer COM port.

17. T

HREADED HOLE FOR POWER SUPPLY CABLE CLAMP

. Use the provided cable clamp to clamp the power supply cable to the back panel of the EF1210 for str ain relief.

18. P

OWER SUPPLY INPUT

. Connects to the external power supply provided with the

EF1210.

Caution!

Use only the power supply provided with the EF1210. Use of other power supplies will void the warranty and may

cause damage.

19. M

IC/LINE INPUTS

. Connects to microphone at either mic or line level, with or

without phantom power (both selectable with DIP switches).

20. A AEC A and is output to R

. Connects to the output of the automixer. This is internally mixed with

MIX IN

. This is only needed when recording from the

EF1210. See “Playback/Record” on page 22 for a description of the Record and Playback mixer circuitry. See also ‘T

21. A

Note.

UX IN

must be a 0 dBu signal.

MIX IN

. Connects to the output of a tape recorder, VCR, or other recording

CODEC” (number 26).

device. Playback from a program audio device is only available with the Reference A input signal. See “Playback/Record” on page 22 for a description of the Record and Playback mixer circuitry.

22. AEC A R

EF INPUT

. Connect to the output of a CODEC or hybrid connected to

Zone A.

23. AEC B R

EF INPUT

. Connect to the output of a CODEC or a hybrid connected to

Zone B.

24. L

INE OUTPUTS

. Connect to the inputs of an automixer or matrix mixer.

Caution!

25. R

. Connects to a recording device. REC requires taking the output from the

Set mixer inputs to 0 dBu line level, phantom power OFF.

automixer (or an output of a matrix mixer) and plugging that back into the EF1210 so that the local side of the conference can be recorded. See “Playback/ Record” on page 22 for a description of the R ecord and Playback mixer circuitry.

26. T

O CODEC

plugged in to A

. Connects to the CODEC. When the output of the automixer is

MIX IN

, the TO C

signal is a mix of the A

ODEC

MIX IN

and AUX IN signals. This is only needed when you want to add a Playback signal to the automixer output before it is sent to the C ODEC. See “Pla yback/R ecor d” on page 22 for a description of the Record and Playback mixer circuitry.

27. Z

28. Z

A. Connects to an audio amplifier or powered loudspeaker in Zone A.

ONE

B. Connects to an audio amplifier or powered loudspeaker in Zone B

ONE

(optional).

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 13

EF1210 U

SER MANUAL

How to Get Useful Information from the Signal Level Meters

When configuring the EF1210, it is very important to know which signal level meter to look at. On the front panel, there are two signal level meters — the I level meter and the R (microphones 1-8), use th e I inputs (AEC A and AEC B), use the R

signal level meter. When configuring the input channels

EMOTE

signal level meter. When configuring the reference

NPUT

signal level meter.

EMOTE

NPUT

signal

Take note that unlike a microphone mixer, the signal level meters do not show a total output signal, meaning the EF1210 does not add up, for example, all eight input signal levels and show them on the I

signal level meter. Instead, what is shown on

NPUT

the signal level meters is the individual signal level of the inpu t channel or reference. To display the desired input or reference signal when the EF1210 is in normal opera-

tion (not setup mode), press the appropriate S

button. Push the REF S

ELECT

button to cycle through the two reference inputs. Push the I

NPUT SELECT

button to

ELECT

cycle through the eight input channels. Use the LEDs on the right side of the front panel as an indicator of which level is displayed on the LED meter. The input channels are indicated by the LEDs labeled C

HANNELS

1-8. Reference inputs are indicated

by the AEC A or AEC B LED. If you do not see activity on the signal level meter while a talker is talking, do not

immediately assume that the level needs to be turned up. First check to make sure you are looking at the correct input or reference on the signal level meter.

DVANCED INSTALLATION

ONFIGURATION

Configure the DIP Switches

ID 8

ID 4

ID 2

ID 1

HANTOM

INELINELINELINELINE

HANTOM

5-8

HANTOM

ESERVEDRESERVED

HANTOM

ID 16

EVICE

Figure 2. DIP Switches on EF1210 Back Panel

Note.

1 M 2 P 3 M 4 P 5 M 6 P 7 M 8 P 9 M

10 P

WITCH

When the DIP switch is down (as shown in the diagram in Figure

2), it is in the OFF position. When the DIP switch is up, it is in the ON position. The default factory setting for all switches is OFF.

The following is a description of each DIP switch and its function.

ABEL

1/L

HANTOM

2/L

HANTOM

3/L

HANTOM

4/L

HANTOM

5-8/L

INE

1 Sets phantom power for microphone 1. See Caution below.

INE

2 Sets phantom power for microphone 2. See Caution below.

INE

3 Set phantom power for microphone 3. See Caution below.

INE

4 Sets phantom power for microphone 4. See Caution below.

INE

UNCTION

Sets mic or line level for input 1 on the EF1210

Sets mic or line level for input 2 on the EF1210.

Sets mic or line level for input 3 on the EF1210.

Sets mic or line level for input 4 on the EF1210.

Sets microphones 5-8 as a group to accept mic or line level input. This permits any combination of mic and line level inputs by careful selection when connecting cables to inputs. Switch 9 in Line position allows 0-4 microphone inputs; switch 9 in Mic position allows 4-8 microphone inputs.

HANTOM

5 Sets phantom power for microphone 5. See Caution below.

Table 1: DIP Switch configuration

ASPI Digital -

The Sound of DSP

Technical Support: 404.892.3200 15

EF1210 U

SER MANUAL

WITCH

11 P 12 P 13 P 14 R 15 R 16 D 17 D 18 D 19 D 20 D

ABEL

HANTOM HANTOM HANTOM

ESERVED ESERVED EVICE EVICE EVICE EVICE EVICE

6 Sets phantom power for microphone 6. See Caution below. 7 Sets phantom power for microphone 7. See Caution below. 8 Sets phantom power for microphone 8. See Caution below.

ID 16 See Table 2 on page 17 ID 8 See Table 2 on page 17 ID 4 See Table 2 on page 17 ID 2 See Table 2 on page 17 ID 1 See Table 2 on page 17

Table 1: DIP Switch configuration

UNCTION

Reserved and must always be set to the OFF position Reserved and must always be set to the OFF position

Caution!

Phantom power should be turned OFF unless you are using a microphone that requires phantom power.

DVANCED INSTALLATION

Device ID

Device ID Switch 16

0 (default) 1 ON 2ON 3ONON 4ON 5ONON 6ONON 7ONONON 8ON 9ON ON 10 ON ON 11 ON ON ON 12 ON ON 13 ON ON ON 14 ON ON ON 15 ON ON ON ON 16 ON 17 ON ON 18 ON ON 19 ON ON ON 20 ON ON 21 ON ON ON

These switches set the Device ID for the EF1210. The ID can be any number from 0 to 31. It is a five bit binary number, with the least significant bit on switch 20. The number after the “Device ID” label denotes the binary value of the switch. Table 2 lists the DIP switch positions necessary to set each Device ID number from 0 to 31.

The Device ID is the same ID that is used with the EF1210 Command Set. The EF1210 will respond only to commands that are sent with the same Device ID as the one set on its switches. If you set the Device ID to one that doesn’t agree with your remote control commands, the remote control will no longer affect that particular EF1210.

If you are not using a remote control device (via RS-232 o r the ASPI Bus), the Device ID settings do not matter. The default Device ID is 0.

Table 2: DIP Switch Positions for EF1210 Device IDs (Blank spaces mean switch is OFF)

(Device ID 16)

Switch 17 (Device ID 8)

Switch 18 (Device ID 4)

Switch 19 (Device ID 2)

Switch 20 (Device ID 1)

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 17

EF1210 U

SER MANUAL

Device ID Switch 16

(Device ID 16)

22 ON ON ON 23 ON ON ON ON 24 ON ON 25 ON ON ON 26 ON ON ON 27 ON ON ON ON 28 ON ON ON 29 ON ON ON ON 30 ON ON ON ON 31 ON ON ON ON ON

Switch 17 (Device ID 8)

Switch 18 (Device ID 4)

Switch 19 (Device ID 2)

Switch 20 (Device ID 1)

DVANCED INSTALLATION

ONNECTING THE

Overview

EF1210 TO

OTHER EQUIPMENT

Each AEC input channel must be associated with 4 signals: local input, local output, remote input and remote output. The local input can either be a microphone or line level input. Since the inputs are typically connected to microphones, the inputs will be referred to as microphone inputs in this manual. The local output is the zon e out-

ONE

A or Z

put (Z the remote output is the L

Caution!

B). Remote input is the reference input (AEC A or AEC B) and

ONE

INE OUTPUT

Set mixer inputs to 0 dBu line level, phantom power OFF.

ZONE A AEC A

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

CH 8

EF1210

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

Auto

Mixer

TO AEC

(Optional)

FROM AEC

EF200

FROM

REMOTE

CODEC

Figure 3. Single room using an EF1210 (single zone).

PSTN

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 19

EF1210 U

SER MANUAL

Zoning

The EF1210 may be configured to work with a single AEC reference input or with two distinct AEC reference inputs. If a single reference is used, the two zone outputs (Zone A and Zone B) will carry the same signal, and either or both of them may be connected to room audio amplifiers. An example of using a single reference on the EF1210 is shown in Figure 3 on page 19. If two references are used, two distinct zone output signals will be generated, one (Zone A) correspond ing to Reference A (AEC A) and the other (Zone B) cor responding to Reference B (AEC B). These may, for example, feed room audio amplifiers in two acoustically isolated areas or rooms. Each input channel must be associated with exactly one of the two references. By default, all channels are associated with AEC A. If two references are used, some microphone input channels will in the soundfield of Z

A and must therefore be

ONE

associated with Reference A (AEC A), while other microphone input channels will lie in the soundfield of Z

B and must therefore be associated with Reference B (AEC

ONE

B). See Figure 4 on page 20 for a block diagram of using a single EF1210 with two references and zones.

PSTN

Room A

Room B

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

CH 8

ZONE A AEC A

EF1210

ZONE B AEC B

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

Auto Mixer (A)

Auto Mixer (B)

TO AEC

FROM AEC

TO AEC

FROM AEC

REMOTE

EF200 (A) (Optional)

REMOTE

EF200 (B) (Optional)

REMOTE

FROM

CODEC

(A)

CODEC

(B)

PSTN

Figure 4. Two independent rooms using a single EF1210

DVANCED INSTALLATION

Typical EF1210 Connections

5-8

HANTOM

INELINELINELINELINE

HANTOM

Remote Control System

ASPI BUS IN

ID 8

ID 4

ID 2

ID 1

ID 16

EVICE

ESERVEDRESERVED

HANTOM

ASPI BUS OUT

The EF1210 will typically be connected to other equipment in a single zone setup as shown below in Figure 5.

POWER LOW HIGHVOLUME

microphone

8 microphones

(Optional)

PIN 2: TX

PIN 2: TXD

3: RX

3: RXD

REMOTE CONTROLREMOTE CONTROL

RS-232

5, 15 VDC 5, 12 VDC

. . .

MIC/LINE INPUTS

436587 PLAY

ASPI Bus Connection for RS-232 Control

)

VERRIDE

UPPRESSION

ID 4

ID 3

ID 2

ID 1

ID 0

OISE

EVICE

ESERVED

PROM

AGC

REMOTE CONTROL

RS-232

LOGIC IN/OUT

microphone

AEC REF

AUX

AMIX

AEC BAEC A 21436587 REC

8 Line Level Signals

Reference Input

ASPI BUS

TO PHONE

EF400

INTERFACE

ASPI BUS

TO LINE

OUT

EF1210

LINE OUTPUTS

. . .

Automatic

Microphone

Mixer

EF200 Phone Add (Optional)

FROM

AECTOAEC

REMOTETOREMOTE

5, 15 VDC

FROM

POWERED SPEAKER

CODEC

ZONE

POWER

Figure 5. Typical EF1210 Connections

• Connect each of the 8 M accepts mini-Phoenix connectors. See “Connector Pinouts” on page 88 for pinouts.

• Connect each of the 8 L mixer. Each L

Caution!

• Connect the zone output (Z speaker.

• Connect the reference input (AEC A or AEC B) to T nect only one reference per EF200) or to the output of the CODEC.

• Connect the output of your aut omi xer to F of your CODEC.

• If RS-232 remote control is desired, connect the RS-232 R of the EF1210 to the remote control device, such as an RS-232 interface to a touch panel or a COM por t on a personal computer. Connect the ASPI B on the EF1210 to the ASPI B

CODEC/hybrid

TX RX

INE INPUT

IC/LINE INPUTS

INE OUTPUTS

INE OUTPUT

PSTN

to a microphone. The MIC/L

to the inputs of an automixer or matrix

uses a mini-Phoenix connector.

Set mixer inputs to 0 dBu line level, phantom power OFF.

A or Z

ONE

on the EF200, if you are using an EF200

US IN

B) to an amplifier or powered loud-

ONE

AEC on the EF200 (con-

AEC on the EF200 or to the in put

ROM

EMOTE CONTROL

port

US OUT

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 21

Phone Add.

EF1210 U

SER MANUAL

Playback/Record

Note.

The external RS-232 control device may b e co nnected to an y ASPI device to control all ASPI devices that are linked via the ASPI Bus.

• Connect the external power supply to the P

OWER SUPPLY INPUT

jack of the

EF1210.

The EF1210 provides the capability to record a nd play back audio to y our conference. Playback allows you to play the audio output of an external device, such as a television or VCR, to the conference. Record allows you to record the audio of the conference to an external device, such as a tape recorder.

auto-reverse

TAPE RECORDER

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

CH 8

VCR

ZONE A

REC

12:00

AUXINTO

CODEC

EF1210

AEC A

AMIX

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

Auto

Mixer

CODEC

Figure 6.

Block diagram of record and playback connections with the EF1210.

To implement the playback function with the EF1210, a playback signal must be added to both the local audio (Zone) output and the remote output (the signal sent to the CODEC or other terminal communication device). To implement the record function, both the local audio and the remote CODE C signal must be mixed and output to a recording device. Since the remote output will normally be produced by an automixer external to the EF1210, the output of the a utomixer must be av ailable to be mixed with the R

and AUX IN signals. This mixing may be implemented using an

external matrix mixer if available, or using the internal mixers provided in the EF1210. In addition to the convenience of using the EF121 0 mixers, th e EF1210 provides remote control of the level of the A

signal so that weak recordings may be

UX IN

boosted to be audible at both ends. To use the EF1210 Playback mi xer, the out put of th e automix er must be brough t in to

the A minal device) must be taken from the T input on the EF1210 will be added internally to the T Z

ONE

input on the EF1210, and the input to the CODEC (or other remote ter-

MIX IN

CODEC output of t he EF1210. Th e AUX IN

CODEC signal, and also to the

A output.

DVANCED INSTALLATION

To use the internal EF1210 Record mixer, the output of the automixer must be brought in to the A from the automixer output as well or may be taken from the T EF1210. The R

input on the EF1210. The input to the CODEC can come

MIX IN

CODEC output of t he

output will carry a mix of the A

and the AEC A signals.

MIX IN

Alternatively, you can do this mixing externally (con nect playb ack o utput of ex ternal program audio device to an automixer input). If record and playback signals are generated using an external mixer, the A

UX IN

and A

inputs and the REC and TO

MIX IN

CODEC outputs will not be used on the EF1210.

Note.

If the EF1210 AUX IN is not used, the playback signal should be mixed with the AEC Reference signal rather than with the Zone

output signal for local p l ayback.

Playback and record are only available with the Reference A (AEC A) and Zone A signals. If two zones are used, playback will NOT function properly in Zone B because it will only be added to Reference A input signal from the far-end.

Using playback and record in the second zone of a multi-zon e system will require using the matrix mixer to create appropriate mixes outside of the EF1210.

See Figure 7 on page 23 below for the interconnection of A

and REC input and

UX IN

output, respectively.

Ch 3

. . .

AEC

EF1210

Ch 4 AEC

Rec

Amix

CODEC

Aux

+ ++

GainGain

A/D

Level adjust

Line

AEC

Reference

A/D

Level

adjust

Line

AEC

Reference

Ch 5

AEC

Ch 6 AEC

. . .

Figure 7.

Playback and Record in the EF1210

To record,

• Connect the R

output of the EF1210 to the audio input on the recording

device.

• Connect A

• Connect T

to the output of the automixer or matrix mixer.

MIX IN

O CODEC

to F

AEC on the EF200 or the input of the CODEC.

ROM

For playback,

• Connect the A

of the EF1210 to the audio output of the playback

UX IN

device.

• Connect A

to the output of the automixer or matrix mixer.

MIX IN

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 23

EF1210 U

SER MANUAL

• Connect TO C

Note.

When using the internal EF1210 Record and Play circuitry, a signal being played back will NOT be reco rd ed to avoid the potential

of a feedback loop caused by the record/playback device.

ODEC

to F

AEC on the EF200 or the input of the CODEC.

ROM

DVANCED INSTALLATION

Figure 8 on page 25 depicts connections on the EF1210 for record and playback.

INELINELINELINELINE

microphone

8 microphones

. . .

POWER LOW HIGH VOLUME

Remote Control System

(Optional)

EF1210

LINE OUTPUTS

8 Line Level Signals

. . .

HANTOM

ESERVEDRESERVED

ASPI BUS IN

PIN 2: TXD

PIN 2: TX

3: RX

ASPI BUS OUT

3: RXD

REMOTE CONTROLREMOTE CONTROL

ID 8

ID 4

ID 2

ID 1

ID 16

EVICE

5-8

HANTOM

RS-232

5, 15 VDC 5, 12 VDC

MIC/LINE INPUTS

436587 PLAY

AEC REF

AUX

AMIX

AEC BAEC A 21436587 REC

Record Output

Play Input

Automatic

Microphone

Mixer

ASPI BUS

OUT

Reference Input

TO PHONE

EF400

INTERFACE

TO LINE

EF200 Phone Add (Optional)

FROM

AECTOAEC

REMOTETOREMOTE

ASPI Bus Connection for RS-232 Control

)

auto-reverse

VCR

TAPE RECORDER

12:00

VERRIDE

UPPRESSION

ID 4

ID 3

ID 2

ID 1

ID 0

OISE

EVICE

ESERVED

PROM

AGC

REMOTE CONTROL

RS-232

LOGIC IN/OUT

Record and Play Devices

PSTN

CODEC/hybrid

POWERED SPEAKER

ZONE

CODEC

Output to EF200 (optional) or CODEC

5, 15 VDC

TX RX

ZONE

POWER

Figure 8. EF1210 Connections for Record and Playback

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 25

EF1210 U

SER MANUAL

Connecting Multiple EF1210s

ID 8

ID 4

ID 2

ID 1

5-8

HANTOM

Device ID 0

5-8

HANTOM

Device ID 1

HANTOM

ESERVEDRESERVED

ID 16

EVICE

ID 8

ID 4

ID 2

ID 1

ID 16

EVICE

HANTOM

INELINELINELINELINE

HANTOM

INELINELINELINELINE

Multiple EF1210s can be easily connected together to add more zones or microphones to your setup. The ASPI Bus allows multiple dev ices to be controlled by a single RS-232 connection. Reference signals to each EF1210 must still be wired to each EF1210.

ASPI BUS IN

ASPI BUS OUT

ASPI BUS IN

ASPI BUS OUT

PIN 2: TXD

PIN 2: TX

3: RX

3: RXD

REMOTE CONTROLREMOTE CONTROL

PIN 2: TXD

PIN 2: TX

3: RX

3: RXD

REMOTE CONTROLREMOTE CONTROL

5, 15 VDC 5, 12 VDC

RS-232

5, 15 VDC 5, 12 VDC

RS-232

MIC/LINE INPUTS

436587 PLAY

MIC/LINE INPUTS

436587 PLAY

AEC REF

AMIX

AUX

AEC BAEC A 21436587 REC

8 Line Level Signals

AEC REF

AMIX

AUX

AEC BAEC A 21436587 REC

8 Line Level Signals

LINE OUTPUTS

. . .

Automatic

Microphone

Mixer

LINE OUTPUTS

. . .

Automatic

Microphone

Mixer

CODEC

ZONE

POWER

ZONE

POWER

HANTOM

ESERVEDRESERVED

ASPI BUS IN

PIN 2: TXD

PIN 2: TX

3: RX

ASPI BUS OUT

3: RXD

REMOTE CONTROLREMOTE CONTROL

RS-232

ID 8

ID 4

ID 2

ID 1

ID 16

EVICE

HANTOM

INELINELINELINELINE

HANTOM

5-8

HANTOM

Device ID 2

Figure 9. Connecting multiple EF1210s

Connecti ng th e ASPI Bus

The ASPI Bus can connect multiple ASPI Digital products, such as the EF1210, to the same RS-232 remote control device. This means only one RS-232 connection is needed to control all devices on the ASPI Bus. Each device on the ASPI Bus should have a different Device ID or Type ID, so that each device can be addressed and controlled individually. Note that each different type of ASPI Digital product (e.g. EF200, EF1210) has a distinct Device Type. This means, for example, that an EF200 may have the same Device ID as an EF1210 without causing a conflict. These steps should be followed to connect the ASPI Bus:

1. Connect the RS-232 remote control device to the first ASPI Digital product in the

2. Connect an ASPI Bus cable between the A

3. Connect an ASPI Bus cable between the A

5, 15 VDC 5, 12 VDC

Note.

chain.

the A

SPI BUS IN

the A

SPI BUS IN

MIC/LINE INPUTS

436587 PLAY

AEC REF

AUX

AMIX

AEC BAEC A 21436587 REC

8 Line Level Signals

LINE OUTPUTS

. . .

Automatic

Microphone

Mixer

CODEC

ZONE

POWER

The Device ID of each EF1210 should be different from other EF1210s connected together.

SPI BUS OUT

of the first device, and

of the second device.

SPI BUS OUT

of the second device, and

of the third device, and so on.

DVANCED INSTALLATION

ALIBRATION

For the EF1210 to work effectively, it must be calibrated properly to receive correct levels from the surrounding equipment, such as micropho nes, amplifier, and CODEC. The calibration procedure is required only to adjust the EF1210 to accommodate the electrical characteristics of your conferencing equipment. The procedure allows you to connect the widest po ss ibl e variety of equipment to your EF1210. It does no t t rai n the AEC. The EF1210 does not require training.

In calibration mode, the EF1210 generates a precise noise signal for measuring the characteristics and sensitivity of the microphone. You only need to perform this calibration at the initial installation. You do not have to calibrate the EF1210 each time it is used.

Calibration Steps

Acoustic Gain

Note.

• Calibration Step 1: Calibrating Microphone Input Channels (page 29)

• Calibration Step 2: Calibrating Zone Outputs, Check Acoustic Gain (page 30)

• Calibration Step 3: Calibrating AEC Reference Inputs (page 32)

• Calibration Step 4: Calibrating for Playback and Record (page 33). This step may be skipped if you are not using playback and record on the EF1210.

• Calibration Step 5: Zone/Reference Setup (page 34)

Acoustic gain is the maximum amplification that may be applied to a room’s audio before being picked up by the microphone(s). The volume control may be set at a lower level than this maximum amplifi cation, but must not be set higher. Too much acoustic gain occurs if the loudspeaker volume going into the microphone is louder than the local talker’s volume. This may happen as a result of a combination of the following setups: the loudspeaker volume is turn ed up too much, the microphone level is too high, the microphone is too close to the loudspeaker, or the talker is no t talking close enough to the microphone relative to the loudspeaker volume. Acoustic gain is commonly misunderstood, so when the audio in a room is not loud enough , it seems logical to turn up the volume on the amplifier or loudspeaker. This is often not the best remedy. For example, it may be necessary to tur n up the reference input level instead. Breaking through the acoustic gain threshold can cause echoes and howling as loudspeaker levels overpower the microphones.

The calibration procedure will outline how to associate a volume level with the acoustic gain of a room. Refer to “Check Acoustic Gain” on page 31.

When calibrated for the particular microphone and CODEC setup, the EF1210 will provide years of service without recalibra-

tion. If the signal levels are not calibrated, the performance of the EF1210 will not be satisfactory. When the signal levels are calibrated correctly, the EF1210 easily and automatically handles any type of signals and changes in room acoustics to provide unparalleled echo cancellation performance.

If you decide to use a different kind of microphone once the EF1210 has been calibrated, the microphone inputs on the

EF1210 will be n eed to be recalibr ated.

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 27

EF1210 U

SETUP

SER MANUAL

Two Methods of Calibration

The EF1210 can be calibrated two ways: calibrating with a computer or wi th out. We recommend using a computer for calibration because it is an easier procedure and it is more precise. If you have a computer, please refer to our on-line document for computer calibration procedures. See “Calibrating With a Computer” below for our web address. If you do not have a computer, please refer to ““Calibr ating Without a Computer” on page 28” for front panel setup.

ALIBRATING WITH A COMPUTER

Included in your shipmen t of the EF1210 is a dis kette co ntai ning t he EF Panel C ontro l Software and a PDF version of the EFPanel User Manual, which includes installation instructions. Install EFPanel and use it to calibrate the EF1210 with a computer. Also included is a hardcopy of this manual. This control software and manual may be changed and updated periodically, so please visit our website at http://www.aspi.com for the most recent versions.

ALIBRATING WITHOUT A COMPUTER

In Calibration mode, the S are currently executing. The different modes are shown in Table 3 below. Press the A

UX IN LEVEL/SETUP

you have finished Calibration Step 5, press the A exit Calibration mode; any changes that you made will be saved as the default poweron settings when you exit the Calibration procedure.

LED will blink to let you know which setup step you

ETUP

button to move from one Calibration s tep to the next. When

UX IN LEVEL/SETUP

button again to

If you miss a Calibration step or lose your place and get to the wrong C alibration step, you may either continue and come back to the missed step later or exit Calibration mode (by pressing A

UX IN LEVEL/SETUP

button repeatedly until the S

ETUP

LED is no longer illuminated), re-enter Calibration mode, and resume Calibration at the step that you missed. If you wish to exit Calibration mode and discard any changes that you

made, you must cycle power on the EF1210 before exiting Calibration mode.

Legend:

LED Off LED On ButtonLED Blinking

Figure 10. Legend for calibration drawing s.

ALIBRATION MODE

MIC Input Calibration S Z

Output Calibration S

ONE

AEC R

Input Calibration S

Calibrating for Playback and Record S Zone/Reference Setup S

LED blinks on ce per period

ETUP

LED blinks twice per period

ETUP

LED blinks three times per period

ETUP

LED blinks four times per period

ETUP

LED blinks five times per period

ETUP

Table 3: Visual indication of calibration mode.

DVANCED INSTALLATION

ALIBRATION STEP

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

Note

ALIBRATING MICROPHONE

1: C

One period equals the number of blinks per step plus one off-time.

1.1. Press and hold the AUX IN L

two seconds to enter configuration mode of the EF1210. For Calibration Step 1, the S

LED will blink once per period. For this step you wi ll need a Sound

ETUP

Level Meter (SPL Meter).

STEP 1.1: Press and hold AUX IN LEVEL/

SETUP button

INPUT SELECT for 2

seconds to enter

configuration mode

LEVEL

MUTE

ADJUST

ALL

STEP 1.7: adjust

level until 3 green

and 1 yellow LEDs

are lit (repeat for

each channel)

EVEL/SETUP

STEP 1.3:

press to select

and

channel for

calibration

AUX IN

REF

LEVEL

SELECT

SETUP

STEP 1.2: press to

select noise source

NPUT CHANNELS

button and the I

LED blinks

once for

microphone

calibration

INPUT

SETUP

AECAAEC

NPUT SELECT

LEDs light to

indicate which

channel is selected

12345678

pink noise to both zones no noise generated pink noise to zone A

pink noise to zone B

noise level

measured at mic

should be at the appropriate SPL

level from Table 3

button for

Figure 11.

Calibrating Mic Inputs

1.2. If necessary, press the R

1.3. Press the I

1.4. Set the SPL meter (Sound Level Meter) to C weighted, slow response. Choose

Table 4:

EF SELECT

button to select which zone the pink noise is

being played in.

• When you first enter configuration mode, pink noise is played in bo t h Zone A and Zone B.

•Press R

EF SELECT EF SELECT EF SELECT

• Repeated pressing of R

for no pink noise in Zone A or Zone B. again for pink noise in Zone A. again for pink noise in Zone B.

EF SELECT

will cycle through these four modes. See

Figure 11 on page 29.

NPUT SELECT

button to choose the input channe l.

the appropriate dB SPL range using Table 4 below based on microphone type and the talker’s distance from the microphone.

ICROPHONE TYPE

YPICAL DISTANCE FROM

ALKER (FT

SPL L

(dB)

EVEL

Lavalier 6 inches to 1 foot 89 dB SPL

Gooseneck 1-2 feet 77 dB SPL

Boundary or other tabletop 2-3 feet 73 dB SPL

Ceiling 4 or more feet 69 dB SPL

Typical distance from microphone to talker and appropriate d B SPL l evel .

1.5. Place the SPL meter beside the microphone. Point the SPL meter and the micro-

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 29

phone toward the loudspeaker.

EF1210 U

SER MANUAL

Note

1.6. Adjust the loudspeaker volume so that a nominal dB SPL level based on Table 4 is registered at the microphone.

Note

1.7. Use the L 1 yellow (or 0 dB) LED are lit on the I

1.8. Repeat steps 3 - 7 for all input channels.

1.9. Return all microphones to their normal operating location and orientation.

Note

It is vital to move the SPL meter and/or microphones so that each

microphone sees the correct dB SPL acoustic level as you are calibrating. Do not assume that because the first microphone sees the dB SPL level, all other microphones will see the same level (unless they are moved to occupy the same location as the first).

Always double check the microphone level with normal speech

once the microphones are in normal operating position. Actual speech levels may vary depending on room reverberation, etc. Verify that you set a reasonable level (three green LEDs and one solid yellow LED, or 0 dB) by actually ta lking and looking at the meter.

EVEL ADJUST

Use caution if the microphones lie in two acoustically sep ar at e d

zones and you are only calibrating one zone. As you cycle throug h microphones that lie in the other zone, no activity will be indicated on the I

buttons to adjust the channel input gain until 3 green and

NPUT SIGNAL LEVEL METER

ALIBRATION STEP

ALIBRATING ZONE OUTPUTS

2: C

2.1. Once all input channels have been calibrated, press the AUX IN L button again to switch to Zone Output calibratio n. For Calibration Step 2, the

LED will blink twice per period.

ETUP

This step sets the nominal output level of the Zone Ou tputs to match your room audio equipment. This step also lets you mark the maximum room loudspeaker amplification level permissible without violating the room acoustic gain limit.

EVEL/SETUP

DVANCED INSTALLATION

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

MUTE

ALL

LEVEL

ADJUST

AUX IN

LEVEL

SETUP

STEP 2.6: press

to select

channel;

check level

REF

INPUT

SELECT

LED blinks

twice for Zone

calibration

AECAAEC

SETUP

LEDs light to

indicate which

channel is selected

12345678

STEP 2.6: adjust external

amplifiers/loudspeakers so that

no more than 3 green LEDs are

lit (repeat for each channel)

STEP 2.3a: press

if amp expects

consumer level input (-10 dBV)

Figure 12. Calibrating Zone outputs

2.2. Press the REF S inal level noise signal is played through the selected Zone output(s).

• When the EF1210 first enters Zone Output cali brati on, the AEC A and AEC

• If you want to calibrate only Zone A, press the R

• If you want to calibrate only Zone B, press the R

2.3. Check the specifications of your room audio amplifier input:

• If it expects consumer level (-10 dBV) input, press the L

• If it has a balanced input connector and expects 0 dBu input level, press the

More precise level adjustments can be made with the RS-232 commands (see the GAINZ command on page 68 of the Command Set Re ference.

2.4. If you selected only one of the Zone Outputs, repeat for the second Zone Output.

For visual instructions, refer to Figure 12 on page 31.

STEP 2.3b:

press

if amp

expects 0 dBu balanced input

STEP 2.2:

press to select

noise source

button to choose which output is being calibrated. A nom-

ELECT

noise to both zones (recommended) noise to zone A noise to zone B

B LEDs are lit, indicating that both zones will be calibrated. Use this if you want to calibrate both zones at the same time.

EF SELECT

button to select

Zone A. Only the AEC A LED lights, indicating Zone A.

EF SELECT

button again to

select Zone B. Only the AEC B LED lights, indicating Zone B.

button once.

OWN

EVEL ADJUST UP

EVEL ADJUST

button once.

Check Acoustic Gain.

2.5. At this point you are ready to calibrate the absolute maximum room audio amplification level. For this step, you should ensure that the micro phone s have been returned to their normal operating location and orientation. This procedure uses a known nominal electrical noise signal level at the zone output to let you see if any of the microphone input channels will exceed the permissible acoustic gain during normal conferencing operation. The level of this noise signal is such that if any microphone input channel registers more than three green LEDs on the EF1210 I

NPUT SIGNAL LEVEL METER

channel has been reached. This represents the maximum amplification that may be applied to the roo m audi o. The r oom audi o may be run at any lev el below th is threshold, but should not be amplified beyond this level unless the acoustic gain is reduced by some other means (See “Acoustic Gain” on page 44).

All microphones should be checked in this step as verification that no microphone inputs or zone outputs have been miscalibrated.

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 31

, the acoustic gain limit of that microphone

EF1210 U

As above, both Zones can be adjusted at the same time (both AEC A and AEC B LEDs will be lit indicating Zone A and Zone B). This is recommended because you can check all Input Channels at the same time. Alternatively, if necessary, you may select either Zone by pressing R LED is lit and check one Zone at a time.

EF SELECT

until the appropriate AEC

SER MANUAL

Note.

Adjust the external room audio ampl ifiers/loudspeakers until either:

• The loudspeaker audio level is about to become uncomfortably loud. OR

• Three green LEDs on the EF1210 I

2.6. Next, step through the microphone input channels by pressing the I button, while verifying for each channel that the first yellow (0 dB) LED is not lit on the I

• If the first yellow (0 dB) LED is lit for any channel, turn down the room

Note

You should start by sel ecting (using t he I checking the microphone input channel which is closest to the

loudspeakers or the microphone which might be expected to pick up the most acoustic energy from the loudspea ker audio , as appro priate. Check the acoustic gain of this microphone using Step 5, then quickly step through each of the microphone channels (step 6) to verify that no other microphone has a stronger signal.

NPUT SIGNAL LEVEL METER

the first yellow (0 dB) LED is not lit for the chosen input channel

NPUT SIGNAL LEVEL METER

audio amplifier on the corresponding Zone Output or turn down the gain on that microphone channel.

Do not turn up the room audio level at any point after Step 5.

NPUT SELECT

button) and

are lit, but

NPUT SELECT

ALIBRATION STEP

2.7. When all input channels have been checked, you can mark the positions of the volume controls on the room audio amplifiers and note that this is the absolute maximum amplification that may be applied to room audio. This maximum amplification will be referred to in this manual as the amplifier acoustic gain

limit.

Note

During normal operation, the zone output levels will be set 6 dB lower than the selected level (amplifier acoustic gain limit) to allow the EF1210 L trols to apply a volume ad j us tme nt t o the room audio signal in the range +6 dB to -12 dB.

Refer to Figure 12 on page 31 for further explanation.

ALIBRATING

3: C

3.1. Once the Zone Output channels and room audio amplifier have been calibrated, press the A

The volume control may be set at a lower level than this marked

position (amplifier acou stic gain limit), but must not be set higher or the performance of the echo canceller will be suboptimal.

EVEL ADJUST

AEC R

UX IN LEVEL/SETUP

EFERENCE INPUTS

button again to switch to AEC Reference Input

con-

DVANCED INSTALLATION

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

STEP 3.4: adjust level until person talking at remote

site rarely flickers

second yellow LED

calibration. For Calibration Step 3, the S

LED will blink three times per

ETUP

period.

For this step, you will need a live connection to a remote conferencing site (or two sites if you are configuring the EF1210 for two AEC reference inputs).

• If you are configuring the EF1210 for operation with one AEC reference

input, you will calibrate the AEC A signal.

• If you are configuring the EF1210 for operation with two AEC reference

inputs, you will calibrate both the AEC A and the A EC B signals.

LED blinks three

times for AEC

Reference calibration

MUTE

ALL

LEVEL

ADJUST

AUX IN

REF

LEVEL

SELECT

SETUP

STEP 3.2: press

to select

reference input

source

INPUT

SELECT

SETUP

AECAAEC

12345678

AEC A input selected AEC B input selected

Figure 13. Calibrating AEC Reference Inputs

3.2. Press R by the front panel AEC A and AEC B LEDs. During this step, all other LEDs (I

NPUT CHANNEL

3.3. Have the person at the remote end of the conferencing link sit at a normal distance from a microphone and ta lk at a normal level while you obs erve the signal activity on the R

3.4. Adjust the AEC Reference Input by pressing the L first yellow (0 dB) LED lights regularly during normal speech at the remote end, and the second yellow LED flickers occasionally.

3.5. If you are calibrating two AEC Reference Inputs, switch to the other by pressing R

EF SELECT

Caution!

Refer to Figure 13 on page 33.

ALIBRATION STEP

ALIBRATING FOR PLAYBACK AND RECORD

4: C

EF SELECT

to select between AEC A and AEC B. This will be indicated

) will be extinguished.

EMOTE SIGNAL LEVEL METER

EVEL ADJUST

and repeat the calibration for the second reference signal.

If you skip this calibration step, you will compromise the performance of the EF1210. The audio coming from the remote end may be too low, so if you turn up the loudspeaker to compensate, the acoustic gain will be affected.

buttons until the

4.1. Once the AEC Reference Inputs have been calibrated, press AUX IN L

again to switch to Playback/Record calibration. For Calib rat ion Step 4,

ETUP

the S

LED will blink four times per period. This step calibrates the TO

ETUP

EVEL

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 33

EF1210 U

SER MANUAL

CODEC signal. No other calibration is necessary for Playback/Record.

CODEC signal may be adjusted to match the level required by your

The T

codec (or other remote terminal equipment) input.

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

Figure 14.

Calibrating for playback and record.

Note.

You may skip this step if you are not usin g pl ayb ack an d record on

the EF1210

LED blinks four

times for record

and playback

calibration

MUTE

ADJUST

ALL

STEP 4.2a:

press Ð to set

CODEC OUT

level to -10

dBV

4.2. Press the L Press the L

LEVEL

STEP 4.2b:

press Ï to set

CODEC OUT

level to 0 dBu

EVEL ADJUST DOWN EVEL ADJUST UP

AUX IN

REF

LEVEL

SETUP

SELECT

INPUT

SELECT

SETUP

AECAAEC

12345678

button to set the TO CODEC level to -10 dBV.

button to set the TO CODEC level to 0dBu. More precise level adjustments can be made with RS-232 commands (See the GAINC command on page 62 in the Command Set Reference.).

Refer to Figure 14 on page 34.

ALIBRATION STEP

ONE/REFERENCE SETUP

5: Z

5.1. Enter Zone/Reference Setup mode by pressing AUX IN L ping through the normal configuration sequence. For Calibration Step 5, the

LED will blink five times per period.

ETUP

If you are only using a single zone, you may omit this step.

During Calibration Step 5, you may set the EF1210 to use different AEC Reference Inputs for each channel. The reference signal used with channel 1 will be used as Zone A output, and the reference used with channel 8 will be used as Zone B output. Microphones on the input channels must be placed in the sound field of the appropriate Zone output for the EF1210 to operate correctly; otherwise echoes will not be cancelled. In other words, if for example the microphone on channel 3 is in the soundfield of the loudspeaker connected to the Zone B out-

EVEL/SETUP

after step-

DVANCED INSTALLATION

put, channel 3 must be configured to use Reference B (AEC B) as its reference.

INPUTPOWER REMOTE

-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20

Note

MUTE

ALL

If you are using only one reference signal (Reference A), all

microphones must be configured to use that reference signal. If you are using two reference signals (Reference A and Reference B), Input Channel 1 must be associated with Reference A (AEC A) and Input Channel 8 must be associated with Reference B (AEC B). The other 6 microphones can be associated with either reference.

STEP 5.3: press to

select channel for

LEVEL

ADJUST

calibration

AUX IN

REF

SELECT

INPUT

SELECT

LEVEL

SETUP

STEP 5.2: press to

select reference zone

LED blinks

five times for

zone/ref setup

AECAAEC

SETUP

LEDs light to indicate which

channel is selected

12345678

zone A selected zone B selected

Figure 15.

Zone/Reference Setup

5.2. Use the R

5.3. Press the I

5.4. You may now exit configuration mode and resume normal operation by pressing

Refer to Figure 15 on page 35.

EF SELECT

button to select an AEC Reference (AEC A or AEC B) to be used with the channel indicated by the Input channel LEDs. The AEC A or AEC B LED will illuminate to indicate the selected reference.

NPUT SELECT

button to select the next input channel, and select AEC A or AEC B as reference for that channel. Continue until all eight input channe ls have been configured.

the A

UX IN LEVEL/SETUP

Note

Once you enter setup from the front panel, the configura tion will

button.

be saved as the power-on default once you exit setup. If you wish to discard any changes you made, you must cycle power on the EF1210 before you press the S

button to exit Setup.

ETUP

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 35

OUNTING THE

EF1210

The EF1210 can be mounted in a rack enclosure using four large screws (10-32 x 1/ 2”) included with the unit. One EF1210 fits in a single rack space.

EF1210 U

SER MANUAL

Recommendation For Easy Access

Instructions for Securing Power Supply to Back of EF1210

Thread power cable through cable clamp and attach to

EF1210 back panel for strain relief on the power supply.

HANTOM

INELINELINELINELINE

While not required, it is prudent to leave a single rack space in between the EF1210 and other units in your rack. This not only is a good design practice, but also gives you easier access to the backpanel. If you cannot leave a single rack space, mount the EF1210 below units that are longer in length so that you can access the Phoenix connectors on the backpanel more easily.

• Locate the cable clamp on the back panel of the EF1210 above the RS-232 port.

• Remove the screw and thread the power cord through the cable clamp.

• Attach the cable clamp to the back panel of the EF1210 and tighten the screw. Align the clamp so that the power cable does not interfere with the connectors on the EF1210 ba ckpanel.

• Plug in the power supply.

• We recommend that you also Ty-wrap the power supply to the rack.

5-8

HANTOM

ESERVEDRESERVED

HANTOM

ID 8

ID 16

EVICE

ID 4

EVICE

ID 2

EVICE

ID 1

EVICE

ASPI BUS IN

ASPI BUS OUT

PIN 2: TX

PIN 2: TXD

3: RX

3: RXD

REMOTE CONTROLREMOTE CONTROL

RS-232

5, 15 VDC 5, 12 VDC

MIC/L

435

Figure 16. Attaching a cable clamp to the back panel of the EF1210

The purpose of securing the power supply to the back panel is so that if the power supply were to drop, it would pull where the cord is attached with the cable clamp and not pull the plug out of the EF1210.

DVANCED INSTALLATION

Caution!

Do not use any other power supply other than the one provided with this unit.

Failure to use all four screws to attach the E F1210 to the rack may result in uneven loading and cause a safety hazard.

Ensure that the power supply is securely located such that it cannot become dislodged and fall. Such a fall could cause personal

injury or equipment failure . When mounting an EF1210 in a rack, consideration should be

given to airflow and operating ambient temperatures inside the rack. To ensure safe operation of the EF1210, ambient operating temperatures inside the rack should not exceed 50 degrees Celsius. Allow 2 inches of open space in fro nt of the EF1210, two inches on either side, and four inches behind the unit for proper ventilation. Equipment should not be installed in the rack in such a way as to interfere with the ventilation of the EF12 10.

The EF1210 enclosure is designed to maintain a 1/4” clearance above the top of the u n it. Do not instal l or s t ack EF 121 0s i n su ch

a way as to defeat this clearance.

Do not block the vents on the sides of the EF1210.

Caution!

Consideration should be given to the connection of the equip-

ment to the supply circuit and the effect that overloading of circuits could have an overcurrent protection and supply wiring. Appropriate consideration of equipment nameplate ratings should be used when addressing this concern.

Reliable earthing of rack-mounted equipment should be main-

tained. Particular attention should be given to supply connections other than direct connection to the Branch (use of power strips).

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 37

EF1210 U

SER MANUAL

PERATING THE

SING THE

EF1210 W

Changing Level Display on

LED Meters

EMOTE

NPUT

and

Adjusting Volume in Zones

EF1210

ITHOUT

When the EF1210 is in normal o perating mo de, pushin g the I allow you to see levels of each input channel on the I LED corresponding to an input channel will light if the levels of that channel are currently displayed on the I button will allow you to see the levels of each reference input on the R meter. A yellow LED will indicate which reference (AEC A or AEC B) is displayed on the meter.

The reference LEDs (AEC A or AEC B) do double duty. They not only indicate which Reference Input is currently displayed on the R indicate which Zone Output is affected when the L The AEC A LED indicates that Z A

DJUST

by the L 12 dB below the nominal zone output level. The nominal zone output level is 6 dB below the level selected in Calibration Step 2: Calibrating Zone Outputs.

RS-232 C

button. The AEC B LED indicates that Z

EVEL ADJUST

ONTROL

NPUT SELECT

LED meter. The green

NPUT

LED meter. In the same way, pushing the REF S

NPUT

EMOTE

LED meter, but also

EMOTE

EVEL ADJUST

A’s volume is being adjusted by th e L

ONE

B’s volume is being adjusted

ONE

button. The output levels can be ad justed up to 6 dB abov e and

buttons are pressed.

button will

ELECT

LED

EVEL

Adjusting Playback Levels

Muting

Splitting zones

The AUX IN input and REC output signals are preset to -10 dBV signal levels. The level of the A low or high audio level from an external playback device.

1. During normal operation, press and hold the A using the L level-adjusted A and sent to the T and played over the Zone A output.

To mute channels while using the EF1210 without RS-232 control, for push-to-talk microphones for example, we suggest using the mute control capability on the mixer rather than using a microphone with mute built inside it. The AEC will perform better using this method because it allows the speech to be processed inside the EF1210 before being muted instead of totally cutting off the speech so that the AEC has to readapt when the microphone comes on again.

Calibrate using calibration procedures. When using more than one zone, refer to “Calibration Step 5: Zone/Reference Setup” on p age 34 to associate each microphone input channel with a reference. If you are using two reference signals (Reference A and Reference B), Input Channel 1 must be associated with Reference A (AEC A) and Input Channel 8 must be associated with Reference B (AEC B). The other 6 microphones can be associated with either reference

signal may be adjusted during nor mal operation to compensat e for

UX IN

UX IN LEVEL/SETUP

EVEL ADJUST

UX IN

buttons to adjust the level of the playback signal. The

signal is mixed with the A

CODEC connector. It is also mixed with the AEC A signal

signal (nominally 0dBu)

MIX IN

button while

PERATING THE

EF1210

SING THE

EF1210 W

Serial Port Setup

Changing Level Display on

EMOTE

NPUT

LED Meters

and

ITH

RS-232 C

You can control all of the EF1210’s features with an RS-232 remote control device. The instructions below explain which RS-232 commands are needed to accomplish each function. Users may not need to know these commands, since they may be hidden behind the user interface of the remote control device. A full Command Set Reference is provided at the end of this manual starting on page 53.

For RS-232 control, use an RS -232 cab le — do not us e a null modem . Refer to “Co nnector Pinouts” on page 88 for pin connections for the RS-232 cable. The RS-232 port on the remote control device should be set to 9600, 8-N-1.

When the EF1210 is in normal operating mode, the input channel level displayed on the I

from the RS-232 command set:

Command Description Effects

SELECTI

SELECTI? Request current

LED meter can be checked and adjusted using the following commands

NPUT

ONTROL

Set front panel

LED meter to

NPUT

display input channel n.

assignment of front

NPUT

LED

panel I meter.

The level of input channel n will be displayed on the I and the green LED of the channel will light.

The EF1210 returns channel n, which indicates that the front panel I LED meter is currently set to display input channel n. n ranges from 1 to 8.

LED meter

NPUT

When the EF1210 is in normal operating mode, the Reference Input level displayed on the R

mands from the RS-232 command set::

Command Description Effects

SELECTR

SELECTR? Request current

LED meter can be checked and adjusted using the following com-

EMOTE

Set front panel

EMOTE

LED meter

LED

EMOTE

R to display Reference input c.

assignment of front panel R meter.

The level of Reference input c will be displayed on the R and the yellow LED of the reference will light.

The EF1210 returns Reference input c which indicates that the front panel R display Reference input c. c is either A or B.

LED meter is currently set to

EMOTE

LED meter

ASPI Digital -

The Sound of DSP

Technical Support: 404.892.3200 39

EF1210 U

SER MANUAL

Adjusting Volume in Zones

Adjusting Playback Levels

The volume in the zones can be checked and adjusted using the following commands from the RS-232 command set:

Command Description Effects

GAINZ

x Set zone c output

gain to x.

GAINZ

The AUX IN input and REC output signals are preset to -10 dBV signal levels. The level of the A low audio level from an external playback d evice. The playback level can be adjusted using the following commands from the RS-232 command set:

? Request zone c out-

put gain.

Note.

See the “GAINZc - set ZON E output gain on outp ut c” on p age68 for a more detailed descrip tion of the zone output gain x.

signal may be adjusted during nor mal operation to compensat e for

UX IN

Zone c output gain set to x dB; yellow LED on AEC c will light. c is either A or B. x ranges from 0 to 20 dB.

Current gain for zone c is returned to remote control device.

EVEL ADJUST

con-

Muting

Command Description Effects

GAINPx Set playback input

gain to x.

GAINP? Request playback

input gain.

Note.

The channels on the EF1210 can be muted using th e RS-2 32 co mman d set. Using the MUTEI command will mute the outgoing audio on L is muted. The M

Command Description Effects

MUTEI MUTEI* Mute all channels All channels are muted; the M

See the “GAINP - set PLAYBACK input gain (on AUX IN input)” on page 65 for a more detailed description of the playback input

gain x.

UTE ALL

LED will light only when all channels are muted.

Mute channel n Outgoing audio on channel n is muted.

Playback input gain set to x dB . x ranges from 0 to 15 dB. The default is 8 dB.

Current gain for playback is returned to remote control device.

INE OUTPUT

LED lights.

of the channel that

UTE ALL

PERATING THE

EF1210

Wideband NC vs. AEC mode

Splitting zones

Having the option to turn the AEC off for wideband noise cancellation is particularly useful when used in a system that has both conferencing capabilities and sound reinforcement. For this system, we suggest programming the remote control device to turn on the AEC on each channel of the EF1210 if the roo m is being used f or a conf erence (when the phone or CODEC is connected). At any other time, program the remote control device to turn on wideband noise cancellation for sound reinforce-

ment.

Command Description Effects

SR16 Set sample rate to 16

kHz.

SR48 Set sample rate to 48

kHz.

SR? Request sample rate. Cur rent samp le rate is returned to

Use EF Panel Control Software to calibrate the EF1210. On Calibration Step 5 when using more than one zone, associate each microphone input channel with either Reference A or Reference B. If you are using two reference signals (Reference A and Reference B), Input Channel 1 must be associated with Reference A (AEC A) and Input Channel 8 must be associated with Reference B (AEC B). The other 6 microphones can be associated with either reference

The normal operating mode is 16 kHz. In this mode, AEC can be enabled or disabled.

The wideband mode (48 kHz) is provided for applications that require high-fidelity noise cancellation. In this mode, AEC is disabled.

remote control device.

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 41

ROUBLESHOOTING

EF1210 U

SER MANUAL

NO O

UTPUT TO LOUDSPEAKERS IN ZONE

You can’t hear the remote end.

Check the R switch between Reference A and Reference B. If the LED graph meter shows activity, the EF1210 is receiving a signal. In this case, the problem is between the EF1210 and the loudspeaker.

If there is no activity on the R a signal. In this case, the problem is between the EF1210 and the microphone(s) on the remote end.

Check the CODEC (or EF200) output by connecting it direct ly to the amplifier or powered speaker. If you hear nothing, the EF1210 is not causing the problem and the source of the problem is elsewhere in the system.

Make sure the CODEC or EF200 is connected to the appropriate reference input (AEC A or AEC B) from the appropriate zone.

Make sure the CODEC or EF200 is turned on. Make sure everything on the remote end is working properly. Make sure the cables are not broken. Check the cable pinouts. If you see signal activity on the R

output (Z input.

EMOTE LEVEL INDICATOR

ONE

A or Z

B) is connected to the amplifier or powered loudspeaker

ONE

of the zone (use the REF S

, the EF1210 is not receiving

signal meter, make sure the appropri ate zone

EMOTE

ELECT

button to

NO O

UTPUT TO REMOTE END

Remote end can’t hear you.

Make sure the amplifier or powered loudspeaker is on and that the volume is at an appropriate level. If the zone output level needs adjusting, choose the appropriate zone by pressing the R AEC B LEDs indicate not only the reference input but also the corresponding zone output.

Caution!

Check each microphone’s level on the I activity when you speak into the microphone. You can display each microphone’s input level by using the I the I

NPUT LEVEL INDICATOR

EF1210 is receiving the microphone signal. This means the remote end is not receiving a signal from the EF1210.

EF SELECT

When adjusting amplifier or powered loudspeaker levels, be careful not to exceed the maximum amplification level that

you took note of in the Zone Output calibration (see “Check Acoustic Gain” on page 31).

NPUT SELECT

button on the front panel. The yellow AEC A or

NPUT LEVEL INDICATOR

button to cycle through each microphone. If

shows activity when you speak into the microphone, the

to make sure there is

ROUBLESHOOTING

Check L

INE OUTPUTS

by connecting each output to the amplifier or powered loudspeaker in the appropriate zone (turn the loudspeaker down to avoid howling). If the loudspeaker emits sound when you speak into the microphone, the signal is making it through the EF1210. This means there is a problem with the automixer, CODEC, the CODEC connection, or a device on the remote end.

If the I

NPUT LEVEL INDICATOR

does not display activity, the EF1210 is not receiving

the microphone signals. This means there is a problem with the microphone. If the microphones you are using require phantom power, make sure it is enabled on

the appropriate channel on the EF1210 DIP switches. Make sure the phantom power voltage is compatible with the microphone.

Make sure the automixer output is connected to the CODEC or EF200 input. Make sure the CODEC or EF200 is turned on. Make sure everything on the remote end is working properly. Make sure the cables are not broken. Check the cable pinouts. Make sure the microphone is plugged into the appropriate M

IC/LINE INPUT

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 43

ESIDUAL ECHO

EF1210 U

You may hear residual echo if system levels are not set properly. Improper level settings anywhere in the audio path can introduce nonlinearities that hamper the operation of the EF1210. If you hear residual echo, one of the following conditions may be causing the problem.

SER MANUAL

Reverberation vs. Echo

Finding the Source of Echo

Do not confuse the residual echo of remote speech with the reverberation of local speech. Reverberation of local speech is caused when the speech signal arrives at the microphone via several paths (the dir ect path and multiple ref lections from surfaces in the room). This is a local room phenomenon that gives the talker’s voice a hollow or resonant sound (as heard at the remote end).

Reverberation is not an artifact of the echo canceller. It is mainly affected by the distance of the microphone from the speech source and by the resonances of the room. While reverberation can be unpleasant, it is not compensated for by the AEC, which only removes reflections of remote speech. If the remote end complains that they hear echo, ensure that they are referring to hearing their own voice and not echoes of local talkers.

You cannot remove the effects of reverberation by changing the EF1210’s settings, but you can minimize reverberation by moving microphones closer to talkers and, if necessary, adding acoustical treatment to the room.

Try muting one channel at a time to see if the echo goes away when a particular channel is muted. You can mute the channel by using the MUTEI command on the EF1210 or by muting it on the automixer (turn down volume of the microphone on mixer or use the logic port control). If you find that the echo goes away when a particular channel is muted, the microphone may not be calibrated correctly. Check one or more of the following issues.

Acoustic Gain

The most common cause of poor echo cancellation performance is incorrectly adjusted acoustic gain. This may be explained as follows. The reference signal seen by the AEC is sent to the Zone output, where it is amplified and sent to the room loudspeakers. The loudspeaker audio is coupled into the room microphones acoustically, through direct and reflected acoustic paths, and per haps also throu gh mechanical co upling. The microphone signal is then amplified and sent to the AEC as the local microphone input signal. Th e acous t ic gain o f a mi cro pho ne chan nel refers to the relative levels of the signal sent to the Zone output (before any amplification) and the level of this signal that is reflected as the microphone input (after microphone amplification).

If the electrical level of the reflected signal picked up by microphone is the same as the level of the electrical signal sent from the AEC to the Zone output, the acoustic gain of this microphone channel is said to be 0 dB. If the reflected signal picked up by the microphone is higher than the level of the signal sent to the Zon e output, that microphone channel has positive acoustic gain. The more positive the acoustic gain, the harder the AEC must work to determine which signal is an echo an d which is a local speech signal.

ROUBLESHOOTING

Acoustic Gain Failure

Acoustic gain failure can be caused through a number of mechanisms:

1. The most common is excessive amplification of the remote (reference) signal at

the local Zone output. This may be explained as follows. If the reference signal is too low coming into the EF1210, the room audio amplifier will n eed to be turned up to compensate and bring the room audio to an acceptable level. For example, if the reference signal is 12 dB too low (just barely lighting the first green LED on the R

EMOTE SIGNAL LEVEL METER

), the room audio will need to be amplified by approximately 12 dB to bring it to a reasonable listening level. This adds 12 dB to the acoustic gain, which will most likely cause it to exceed the amplifier acoustic gain limit (See “Check Acoustic Gain” o n page 31.). This situation can be remedied by proper calibration of the Reference input signal.

2. Another common cause of acoustic gain failure is excessive microphone amplification. For example, if a microp hon e is "h ot" by 6 dB, then the reflections of the Zone output signal which are pi cked up by the micro phone will be ampl ified by 6 dB more than necessary. This adds 6 dB to the acoustic gain, which may be sufficient to cause acoustic gain problems. This situation could easily arise if, for example, the conferencing equipment is set up so that participants are too far from the microphone. In such a situation, after correct microphone setup the local microphone audio level may be too low because of the distance from the talker to the microphone. The microphone audio will most likely also be muddy and reverberant. The installer or user may try to solve these microphone audio quality problems by turning up the m icrophone amplification, thus adding to the acoustic gain. This problem can be remedied by proper microphone selection (pickup pattern, directionality) and placement, coupled with proper microphone calibration.

3. A third common cause of acoustic gain problems is excessive coupling between loudspeaker audio and microphones. This can be addressed by reducing the microphone coupling, either by pos it ioni ng micr oph ones so that their pi cku p patterns are biased away from the loudspeaker audio (and direct reflections of loudspeaker audio), repositioning loudspeakers, or reducing the loudspeaker amplification.

In summary, it can be seen from the above that any amplification applied between the reference input and the microphone inputs can add to acoustic gain problems. To avoid problems, ensure that the Reference input signal (as reflected on the R S

IGNAL LEVEL METER

on the I

NPUT SIGNAL LEVEL METER

) is not too low, and the microphone input sign al (as reflected

) is not too high. Run the built-i n EF 12 10 Acous -

EMOTE

tic Gain test to verify that you do not have acoustic gain problems (See “Check Acoustic Gain” on page 31.).

In-Conference Quick Check

ASPI Digital -

The Sound of DSP

If you experience residual echo problems during a conference, you can quickly check that the reference and microphone levels are calibrated and not causing acoustic gain problems by observing the signal level meters as follows.

While the remote end is speaking and everyone on the local end is quiet, observe the activity on the R

EMOTE SIGNAL LEVEL METER

. Remote speech should illuminate the first yellow (0 dB) LED regularly, and the second (+3 dB) LED occasionally. Step through the microphone input channels by repeatedly pressing the I

NPUT SELECT

front panel button while the remote end is speaking (the local end must be silent during this check), and observe the activity on the I

NPUT SIGNAL LEVEL METER

for each microphone channel in response to the remote talker. If any microphone channel exhibits greater signal level activity than that shown o n the R

EMOTE SIGNAL LEVEL

Technical Support: 404.892.3200 45

EF1210 U

, this indicates a possible problem with the acoustic gain on that microphone

ETER

channel. If this excessive coupling activity level is evident on only one microphone input chan-

nel, that microphone channel should either be redirected to reduce coupling to loudspeaker audio, or recalibrated as it will need to be turned down. If the excessive coupling activity is observed on all (or most) microphone channels, then this indicates either that the room audio is too loud or the reference signal may need to be recalibrated (this will be indicated by observing low activity levels on the R L

EVEL METER

SER MANUAL

EMOTE SIGNAL

Excessive Microphone Amplification

Note.

For the EF1210 to adapt effectively, saturation (overload or clipping) must not occur at the A-D converter supplying the microphone input. Saturation introduces nonlinear signal distortions into what the AEC expects is a linearly echoed version of the remote speech.

Nonlinear distortion causes a degradation or divergence of the AEC’s internal model of the room acoustics. In this situation, the EF1210 cannot effectively cancel room echoes and a substantial amount of echo may be heard by the remote party.

Excessive microphone amplification also increases acoustic gain (See “Aco ustic Gain Failure” on page 45.). You can check for excessive microphone amplification by observing the front panel I first yellow LED should illuminate frequently. If the second yello w LED is illuminated constantly during normal speech or if the red LED illuminates or even flickers, reduce the microphone input level.

Note.

Before you readjust the Remote input levels, check to make sure you are looking at the correct remote input level (AEC A or AEC

B) on the R microphone that you are looking at is in the zone that you think it is in and that you are looking at the correct channel on the I L

EVEL INDICATOR

Before you readjust the microphone input levels, check to make sure you are looking at the correct channel on the I

NDICATOR

correct corresponding reference input level on the R I

NDICATOR

EMOTE LEVEL INDICATOR

NPUT LEVEL INDICATOR

. Check also to make sure that you are looking at the

. Check to make sure that the

NPUT

during a normal conference. The

NPUT LEVEL

EMOTE LEVEL

Note.

Insufficient Microphone Amplification

Grossly insufficient microphone gain degrades EF1210 p erformance and weakens the out-bound speech power level. This has the effect of reducing the signal-to-noise ratio of the microphone signal, which is analogous to raising the background noise level in the room. Because this noise is uncorrelated with the echoes within the room, the EF1210’s ability to adapt and cancel echoes is com promi sed.

A second effect of insufficient microphone gain is that the power of the microphone input signal may be substantially lower th an th at of the remote input signal. This

If you adjust the MIC/L gain. Check to make sure that the acoustic gain limit is not

exceeded. See “Check Acoustic Gain” on page 31.

INE INPUT

level, you will affect the acoustic

ROUBLESHOOTING

reduces the ability of the decision logic to determine whether the AEC should be in transmit, receive, or double-talk mode. This effect may reduce the effectiveness of the EF1210 in canceling echoes.

You can check for insuffici ent micropho ne ampl ificati on by observ ing the fron t pane l I

NPUT LEVEL INDICATOR

LED should illuminate frequently. If the I beyond one or two green LEDs during normal speech, increase the microphone’s input level.

during normal conferencing conversation. The first yellow

NPUT LEVEL INDICATOR

never illuminates

Loudspeaker Nonlinearity

Note.

Overdriving the loudspeaker may distort the zone output signal and cause ineffective AEC operation. The EF1210 relies on the linearity of the acoustic feedback path — D-A, amplifier, loudspeaker, microphone, and A-D — to cancel acoustic echoes. If you overdrive the loudspeaker, the acoustic reflections picked up by the microphone do not match the signal fed to the loudspeaker. They are distorted copies of this signal. The EF1210 cannot effectively cancel this distorted signal.

If you suspect the loudspeaker is introducing nonlinearities into the room acoustic path, take these steps to minimize its influence on the echo canceller.

• Keep the loudspeaker’s volume level at less than three-eighths of full scale. If

higher volume is required, the EF1210 should operate effectively at volume settings of up to 50 percent of full scal e. At more than 50 percent, most audio systems and loudspeakers introduce significant nonlinearities. The EF1210 may not adapt under these conditions, and echoes may be heard.

• If the loudspeaker has a bass control, lower it. Excessive bass can cau se a bo omy

effect that is nonlinear. In addition, excessive bass may cause substantial mechanical coupling to the microphone through vibrations induced in the housings and support structures.

• Increase the separation distance between microphones and the loudspeaker. The

EF1210 handles up to 10 dB of acoustic gain between the loudspeaker and the microphone. You may be exceeding this limit if the loudspeaker is pointed directly at the microphones or if the loudspeaker volume is excessive (loudspeaker placement is not critical, but it should not be pointed directly at the microphones).

Before you readjust the microphone input levels, check to make sure you are looking at the correct channel on the I

NDICATOR

correct corresponding reference input level on the R I

NDICATOR

If you adjust the MIC/L gain. Check to make sure that the acoustic gain limit is not

exceeded. See “Check Acoustic Gain” on page 31.

. Check also to make sure that you are looking at the

INE INPUT

level, you will affect the acoustic

NPUT LEVEL

EMOTE LEVEL

EMOTE CONTROL PROBLEMS

If the remote control device doesn’t seem to be affecting the EF1210, there are a few things you can check. Try sending commands that have a visible impact, like the MUTEI command (muting all channels will cause the M look for messages from the EF1210, like acknowledgment or error messages, if the remote control device can display them.

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 47

UTE ALL

LED to light). Also,

EF1210 U

SER MANUAL

Check Command Syntax

Check Device ID

Check RS-232

ONTACTING TECHNICAL SUPPORT

Make sure the commands that are being sent to the EF1210 have the correct syntax. If only a couple of the comman ds are n’t b eing processed, there may be an error in th e syntax of those commands. Remember, the commands are case sensitive. Commands should be typed with all capital letters. The EF1210 should return ERROR# messages if the commands are typed incorrectly, as long as error messages are enabled.

Make sure the Device ID of the EF1210 matches the Device ID of the commands that are being sent. If they don’t match, the EF1210 will ignore all the commands. Try sending a command to all devices (*** instead of Device Type and Device ID). If this works but sending commands to a speci fi c device does n’ t, the Device ID doesn’ t match.

Make sure the RS-232 cable is connected securely to the EF1210 and the remote control device. Also, the RS-232 por t on the remote cont rol device sho uld be set to 96 00, 8-N-1.

If these troubleshooting guidelines don’t resolve the problem you are experiencing with the EF1210, please check our web site (http://www.aspi.com) for the most current technical support information (go to Technical Resources, then to Technical Support). If you have further questions, please contact us at:

Applications Engineering ASPI Digital 1720 Peachtree St. NW Suite 220 Atlanta, GA 30309-2439

Phone: (404) 892-3200 Fax: (404) 892-2512 Email: help@aspi.com

Before contacting us, please review the warranty and repair policy on page 51.

ECHNICAL SPECIFICATIONS

ECHANICAL SPECIFICATIONS

Dimensions 19” (483 mm) W x 8.2” (208 mm) L x 1.75” (45 mm) H (full rack unit) Weight 5.5 lb. Connectors Audio: Mini (3.5mm) quick connect terminal blocks

RS-232: DB9F ASPI Bus In/Out: RJ45

LECTRICAL SPECIFICATIONS

Power 100 - 240 VAC; 50-60 Hz Power Consumption 40 W Phantom Power 28 V Microphone Input -30 dBu to +0 dBu/-66 dBu to -33 dBu, nominal

Range is rear panel switch selectable AEC Reference Input -20 dBu to +0 dBu, nominal, software adjustable Line Output +0 dBu, nom i nal Zone Output -10 dBV (-8 dBu) or 0 dBu, nominal, selectable +6 to -12 dB via front

panel setup.

-20 dBu to +0 dBu, nominal, software selectable via RS-232 setup. Automixer Input 0 dBu, nominal CODEC Output -10 dBV (-8 dBu) or 0 dBu, nominal, selectable via front panel setup.

-20 dBu to +0 dBu, nominal, software selectable via RS-232 setup. Playback Input -10 dBV (-8 dBu), nominal, software selectable -8 to +8 dB gain Record Output -10 dBV (-8 dBu), nominal Input Impedance > 10 kOhms Output Impedance 50 Ohms (drives 600 Ohms) Headroom 20 dB, nominal

ERFORMANCE SPECIFICATIONS

Frequency Response with AEC on: 125 Hz - 7.25 kHz +/- 2 dB

in NC only mode (AEC off): 20 Hz - 22 kHz Echo Cancellation Span 200 ms Total Cancellation > 65 dB Convergence Rate 30 dB/second Noise Cancellation 6 dB or 10 dB, selectable

OMPLIANCE

The EF1210 complies with the ITU G.167 Recommendation for AEC, FCC part 15,

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Technical Support: 404.892.3200 49

and CE requirements.

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FCC Part 15

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equ ipmen t gen erates, uses, an d can r a diate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Op eration of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Warning!

The EF1210 also complies with the CE standards EN50081-1, EN50082-1, and EN60950. Conformity of the equipment with tho se gu idelines is attested by the CE mark.

FCC Regulations state that any unauthorized changes or

modifications to this equipment not expressly approved by the manufacturer could void the user’s authorization to operate this equipment.

ARRANTY INFORMATION

What is covered

For how long

What we will do

Limitations

Any defect in materials or workmanship.

Two years.

If your ASPI Digital product is defective and returned with i n two years of the dat e of purchase, we will repair or, at our option, replace it at no charge to you.

If we repair your ASPI Digital product, we may use new or reconditioned replacement parts. If we choose to replace your ASPI Digital product, we may replace it with a new or reconditioned one of the s ame or similar des ign. The repair or replacement is warranted for either (a) 90 days or (b) the remainder of the or iginal two-year warranty period, whichever is longer.

ASPI Digital shall not be responsible for special, incidental, indirect, or consequential damages resulting from any breach of warranty, or under any oth er legal theory, including but not limited to loss of profits, downtime, goodwill, damage to or replacement of equipment and property, and any cost of recovering, reprogramming, or reproducing any program or data stored in or used with ASPI Digital products.

Some states do not allow limitations on how lo ng an implied warranty lasts, or the exclusion of incidental or consequential damages, so the above exclusions or limitations may not apply to you.

What we ask you to do

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 51

To obtain warranty service for your ASPI Digital product, call us at (404) 892-3200 or fax us at (404) 892-2512 and we will issue a Return Material Authorization number (RMA#). Use the original packaging materials to return the product. Ship the product prepaid to:

ASPI Digital Attention: Warranty Repair RMA# (Must be on package) 1720 Peachtree Street NW, Suite 220 Atlanta, Georgia 30309-2439 USA

Please be sure to include your name, company, address, phone number, and a d escri ption of the problem. After repairing or replacing your ASPI Digital product, we will ship it to you via a surface carrier of our choice at no cost to you. If you wish it shipped via a specific carrier at your cost, you must arrange it when you obtain the RMA#.

Repair or replacement of your ASPI Digital product is your exclusive remedy.

EF1210 U

SER MANUAL

What this warranty does not cover

No User Serviceable Parts

State Law Rights

This warranty does not cover defects resulting from accidents, damage while in transit to our service location, alterations, unauthorized repair, failure to follow instructions, misuse, fire, flood, lightning, acts of God, or use in those countries where such use violates Part 779 of the Export Administration Regulations of the United States Department of Commerce.

If your ASPI Digital pr oduct is not co vered by our warranty, call us at (404) 8 92-3200 or fax us at (404) 892-2512 for advice about whether we will repair your ASPI Digital product and for other repair information, including charges. ASPI Digital, in its sole discretion, may replace rather than repair your ASPI Digital product with a new or reconditioned one of the same or similar design. The repair or replacement is warranted for 90 days.

The limited warranties and remedies set forth above are exclusive and in lieu of all other warranties, whether oral or written, express or implied. ASPI Digital specifically disclaims any and all implied warranties, including, w ithout limitation, the warranties of merchantability and fitness for a particular purpose.

This product contains no user serviceable parts. Please contact ASPI Digital for repairs. Attempts to repair this product by an unauthorized technician will void your warranty.

This limited warranty gives you specific legal rights, and you amy have other rights that may vary from state to state.

EF1210 C

OMMAND SET REFERENCE

EF1210 C

OMMAND SYNTAX

OMMAND SET REFERENCE

The EF1210 Command Set is used to control an EF1210 using an RS-232 remote control device, such as a touch panel or personal computer. The commands control enabling and configuring the EF1210’s features.

The EF1210 Command Set also includes messages, which are se nt back to the remote control device. These messages can contain acknowledgment or status messages in response to EF1210 commands.

This reference describes the syntax of all of the available commands and messages, as well as the purpose and effects of each of these commands. In short, it provides all the information necessary to integrate the EF1210 Command Set into a remote control device.

The EF1210 commands are short strings of text, which are case sensitive. The commands contain a Device Type and Device ID for specifying an individual device in a chain of ASPI Digital products on an ASPI Bus, so that commands can be targeted at a specific unit. They also contain a command name, input channel number (in some cases), and some data to be used by the command. Each command is terminated with a carriage return (^M) character.

Device type

Device ID

Description Number of Characters Range of Values Device Type 1 0-9,A-Z,* Device ID 2 00- 31,** Command Name 1-7 0-9,A-Z Channel Number 1, if applicable 1-8, A-B, 0-3, * Command Data 0-32 ASCII characters Terminator 1 ^M

The Device Type indicates which ASPI Digi tal product the comm and is being sent to. For the EF1210, the device type is always ‘C’.

The Device ID is a two digit decimal number indicating the Device ID number of a specific device. This is the same Device ID that is set by the rear panel DIP switches on the EF1210. The Device ID must always have two digits, so if the ID is less than ten, a leading zero is needed. For example, the Device ID for unit six is ‘06’.

Each EF1210 in a system should have a different Device ID, so they can each be addressed individually. It’s ok for an EF1210 to have the same Device ID as a different ASPI Digital product such as an EF200 Phone Add, because they will be differentiated by the device type.

On the EF1210, the Device ID can be a 2 digit number from 00 to 31

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Technical Support: 404.892.3200 53

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Command name

Channel number

Command data

Sending commands to multiple devices

The command name is a unique string of characters that indicates which command the EF1210 should execute. Command names for different products are not necessarily the same, since the function and features of each product are different. A list of available EF1210 command names is shown in Table 5 on page 55.

The channel number indicates which input channel, reference input, zone output or memory slot the command is being applied to. It is n ot included in all commands. Only commands that need to be applied individually, such as the AEC command, include the channel number. Microphone input channels are denoted in this Command Set Reference by the character ‘n’. Reference inputs and Zone outputs are denoted by the character ‘c’. Memory slot locations are denoted by the character ‘ m ’.

The command data is a string of up to 32 ASCII characters which follows the command name. The allowed content of the command data depends on which command is being used. Usually, this is only one character because most commands just turn a feature on or off. Some commands, however, may have several characters worth of data.

Commands can be sent to multip le devi ces by replacing the device type or Device ID characters with the ‘*’ character.

Example

The following example commands illustrate the different ways you can send commands to multiple devices by replacing the device type and/or Device ID with ‘*’ characters.

Command Effects C12ACKMOD1 Enable acknowledgment mode on the EF1210 with

Device ID 12.

*03ERROR1 Enable error messages for devices of all types with

Device ID 3.

C12AEC*0 Disable AEC on all channels on the EF1210 with

Device ID 12.

***SWVER? Request software version of all devices of all types.

EF1210 C

ALID COMMANDS AND MESSAGES

OMMAND SET REFERENCE

The following table is a list of commands recognized by the EF1210.

Command Meaning Page

ACKMOD enable/disable acknowledgment mode 56

AEC

AECS ERROR enable/disable error messages 61 GAINC set CODEC output gain 62 GAINI GAINP set playback input gain (on A GAINR GAINZ LOCKFP lock front panel (disables front panel buttons) 69 MUTEI

NCL PING see what devices are connected to the remote controller 73 REFASGN RESETF restore settings to factory default 75 RESTNV

SAVENV

SELECTI SELECTR

SR change the sample rate of the EF1210 80 SWVER request software version 81

Table 5: EF1210 Command List

enable/disable acoustic echo canceller on channel n 58 set suppression mode on channel n.59

set MIC/L

set R

EFERENCE

set Z

ONE

enable/disable mute on MIC input channel n 70 enable/disable noise cancellation on channel n 71 set noise cancellation level on channel n 72

n c

assign reference c to input channel n

restore settings from non-volatile memory in memory slot m

save current settings to non-volatile memory in memory slot m

set front panel input meter to display input channel n 78 set front panel remote meter to display remote input

channel c

input gain on channel n 63

INE

input) 65

UX IN

input gain on reference c 66

output gain on ou tput c 68

The following table is a list of messages sent by the EF1210 to the host.

Table 6: EF1210 Message List

Message Meaning Page

ERROR# error condition occurred 82 PONG device resp onse to PING command 83

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 55

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SER MANUAL

ACKMOD -

ENABLE/DISABLE ACKNOWLEDGMENT MODE

Remote Commands

If acknowledgment mode is enabled, the EF1210 will acknowledge each command it receives by repeating the status of the command that was sent. This may be used for verifying that each command is received and recognized by the EF1210. When acknowledgment mode is turned off, the rem ote control dev ice can always request the status of a parameter by sending a query command, such as NC?. W hen ack nowled gment mode is enabled, a query command only generates one message in response. For example, when you send NC?, you d on’t get NC? back in addition to the status of the noise cancellation feature.

Since acknowledgment mode reports the status of the command rather than simply echoing back the command, you get a verification that the command had the effect you thought it would. For example, a command that toggles a parameter will give you the new on or off status, rather than just echoing the toggle command.

The factory default setting for ACKMOD is 1 (on).

The following commands can be sent by the remote control device to enable or disable acknowledgment mode.

Remote Command Effects ACKMOD0 Turn off acknowledgment mode.

EF1210 Messages

Example

ACKMOD1 Turn on acknowledgment mode. ACKMOD2 Toggle acknowledgment mode on or off. ACKMOD? Request status of acknowledgment mode.

The following messages are sent by the EF1210 in response to an ACKMOD? com- mand, or in response to any ACKMOD command when acknowledgment mode is on.

EF1210 Message Message meaning

ACKMOD0 Acknowledgment mode is currently off. ACKMOD1 Acknowledgment mode is currently on.

At the beginning of the example, acknowledgment mode is turned off at first. The remote control device turns on noise cancellation, but does not receive an acknowledgment. The remote control device requests the status of acknowledgment mode,

EF1210 C

OMMAND SET REFERENCE

turns it on, and then turns off noise cancellation. This time, it gets an acknowledgment.

Remote Command EF1210 Message

C23NC1 C23ACKMOD? C23ACKMOD0 C23ACKMOD1 C23ACKMOD1 C23NC0 C23NC0 C23NC2 C23NC1

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SER MANUAL

AECN -

ENABLE/DISABLE ACOUSTIC ECHO CANCELLER ON CHANNEL

Remote Commands

The acoustic echo canceller is the heart of the EF1210, which eliminates echoes and acoustic feedback that occur when loudspeaker audio is picked up by room microphones. The only instance when you may want to use this com mand is when you put the EF1210 into wideband noise cancellation mode, which can only be enabled if the AEC is disabled on each channel.

The factory default setting for AEC

The following commands can be sent by the remote control device to enable or disable acoustic echo cancellation.

Remote Command Effects

0 Turn off AEC on channel n.

AEC

n ranges from 1 to 8.

AEC

1 Turn on AEC on channel n.

AEC

2 Toggle AEC on or off for channel n.

AEC

? Request AEC status for channel n.

is 1 (on).

EF1210 Messages

Example

The following messages are sent by the EF1210 in response to an AEC or in response to any AEC command when acknowledgment mode is on.

EF1210 Message Message meaning

AEC

0 AEC is currently off on channel n.

AEC

1 AEC is currently on on channel n.

In the following example, the remote control device disables the AEC on all channels on the EF1210 with Device ID number 7. Then it enables the AEC on channel 2 and requests the AEC status on channel 6 of the same EF1 210. Acknowledgment mode i s enabled.

Note.

Remote Command EF1210 Message

C07AEC*0 C07AEC*0 C07AEC21 C07AEC21

It is possible to use a wildcard (*) for setting AECn to 0 or 1 (turning on/off), but not for querying or toggling.

? command,

C07AEC6? C07AEC60

EF1210 C

OMMAND SET REFERENCE

AECSN -

SET SUPPRESSION MODE ON CHANNEL

Suppression Level Selection

N TO

The EF1210 has been designed and carefully optimized to provide the best possible balance between removing as much vestigial echo as poss ible and maintaining natural, full-duplex performance when both parties speak at the same time or one party tries to interrupt the other. As designed, the EF1210 should have no difficulty completely removing audible echo and adapting almost instantaneously to movements and level changes within the room as long as the EF1210 is set up correctly. However, it is possible that some room environments may be so harsh as to strain the boundaries of the operation of the EF1210. This may occur if the room is exceedingly reverberant, the room acoustic gain limit is exceeded, or there is an excessive amount of background room no ise which resu lts in a low signa l-to -noise rat io on both local speech and echo signals.

In conditions of excessive background noise, the signal-to-noise ratio of the local speech signal can drop so low as make the conferencing system virtually unusabl e. In such conditions, it is difficult for the AEC to cancel echoes much below the noise floor. While the EF1210’s superior noise cancellation subsystem can reduce the objectionable audible impact of high room noise to make the conferencing experience more enjoyable and less fatiguing, in certain very harsh conditions this may mean that the residual echo is now more audible because the noise floor has been so dramatically reduced.

NORMAL OR AGGRESSIVE

Remote Commands

Another difficult situation for the EF1210 arises when the room acoustic gain limit is approached or exceeded. As the acoustic gain limit is approached, it becomes more difficult for the EF1210 to adapt to level changes or movement in the room (including normal conferencing participant movement, movement of papers, etc.) as a result of which snippets of echo may be heard for longer periods than would be desirable.

Should it be necessary to operate the EF1210 in such hostile conditions, the echo suppression performance of the EF1210 may be enhanced to remove any vestigial traces of echo, at the expense of doubletalk performance. In aggressive suppression mode, users on the remote end will hear dropouts and clipping artifacts when they attempt to talk across a local participant. The AECSn command may be used to select either normal suppression mode (default) or aggressive suppression mode if required by harsh room conditions.

The factory default setting for AECS

The following commands can be sent by the remote control device to set the suppression mode level.

Remote Command Effects

AECS

x Set suppression mode on channel n to x.

x is the noise suppression mode (0 = normal; 1 = aggressive).

is 0 (normal).

AECS

? Request AECS status for channel n.

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 59

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EF1210 Messages

Example

The following messages are sent by the EF1210 in respo nse to an AECS or in response to any AECS command when acknowledgment mode is on.

EF1210 Message Message meaning

AECS

In the following example, the remote contro l device sets the suppression mode to no rmal on all channels on the EF1210 with Device ID number 7. Then it sets the suppression mode on channel 2 to aggressive and requests the suppression mode status on channel 6 of the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07AECS*0 C07AECS*0 C07AECS21 C07AECS21 C07AECS6? C07AECS60

0 Suppression mode is currently normal on channel

1 Suppression mode is currently aggressive on chan-

nel n.

? command,

EF1210 C

OMMAND SET REFERENCE

ERROR -

ENABLE/DISABLE ERROR REPORTING

Remote Commands

EF1210 Messages

When the EF1210 detects an error (usually a command syntax error), it may report it using the ERROR# message. The ERROR command enables or disables the error reporting feature. This is useful for debugging the commands coming from the remote control device.

The factory default setting for ERROR is 1 (on).

The following commands can be sent by the remote control device to enable or disable error reporting.

Remote Command Effects

ERROR0 Turn off error reporting. ERROR1 Turn on error reporting. ERROR2 Toggle error reporting on or off. ERROR? Request status of error reporting.

The following messages are sent by the EF1210 in respo nse to an ERROR? command , or in response to any ERROR command when acknowledgment mode is on.

Example

EF1210 Message Message meaning

ERROR0 Error reporting is currently off. ERROR1 Error reporting is currently on.

In the following example, the remote control device requests the error repor ting status of the EF1210 with Device ID number 7. Then it enables the error reporting of the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07ERROR? C07ERROR0 C07ERROR1 C07ERROR1

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GAINC -

SET

CODEC

Remote Commands

EF1210 Messages

OUTPUT GAIN

The GAINC command sets the CODEC output gain level of the EF1210 to a level between 0 dB and 20 dB. The output gain setting corresponds to a nominal output level that ranges from -20 dBu to 0 dBu, respectively.

The factory default setting for GAINC is 12 (-8 dBu = -10 dBV).

The following commands can be sent by the r emote co ntro l device to set the C ODEC output gain level.

Remote Command Effects GAINCx Set CODEC output gain.

x ranges from 0 dB to 20 dB.

GAINC? Request current CODEC output gain .

The following messages are sent by the EF1210 in response to a GAINC? command, or in response to any GAINC command when acknowledgment mode is on.

EF1210 Message Message meaning

Example

GAINCx CODEC output gain is currently x dB.

In the following example, the remote control device requests the curren t CODEC output gain of the EF1210 with Device ID number 7. Then it sets a new level on the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07GAINC? C07GAINC0 C07GAINC4 C07GAINC4

EF1210 C

OMMAND SET REFERENCE

GAININ -

SET

MIC/LINE

Remote Commands

INPUT GAIN ON CHANNEL

The GAINIn command sets the MIC/L EF1210 to a level between 0 dB and 31 dB. This corresponds to a nominal input signal level between 0 dBu to -31 dBu, respectively for line level. For mic level, th is corresponds to a nominal i nput signal le vel between -33 dBu to -64 dBu, re spectively.

Setting GAINI or -33 dBu mic level. Setting GAINI signal level of -31 dBu line level or -64 mic leve l.

The purpose of the input channel gain is to bring the signal level of the input channel to a constant value at the A/D inside the EF1210. For example, if we expect a -10 dBu line level signal or -43 dBu mic level signal at the input of channel 2, we would set the input gain of channel 2 to 10 dB by sending the command GAINI210. If we expect a lower signal level, say -18 dBu line level or -5 1 dBu mic level, on chann el 3 then we would turn up the gain by 18 dB on channel 3. This would be accomplished by sending the command GAINI318.

The input channel gain is set using EF1210 calibration procedures (See “Calibration Step 1: Calibrating Microphone Input Channels” on page 29.).

The factory default setting for GAINI

The following commands can be sent by the remote control device to set the MIC/

input gain level.

INE

to 0 corresponds to a nominal input signal level of 0 dBu line level,

input gain level on channel n of the

INE

to 31 corresponds to a lower nominal input

is 0 (0 dBu nominal level expected at input).

EF1210 Messages

Remote Command Effects

GAINI

The following messages are sent by the EF1210 in response to a GAINI mand, or in response to any GAINI

EF1210 Message Message meaning

GAINI

x Set M

n ranges from 1 to 8. x ranges from 0 dB to 31 dB.

? Request current M

Note.

The wildcard character (*) is not allow e d for specifying the channel number n for the GAINIn command.

x M

IC/LINE

dB.

input gain on channel n.

IC/LINE

command when acknowledgment mode is on.

input gain on channel n is currently x

input gain on channel n.

? com-

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SER MANUAL

Example

In the following example, the remote control device requests the current MIC/L input gain on channel 5 of the EF1210 with Device ID number 7. Then it sets a new level on channel 5 on the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07GAINI512 C07GAINI512 C07GAINI2? C07GAINI20

INE

EF1210 C

OMMAND SET REFERENCE

GAINP -

SET

PLAYBACK

Remote Commands

INPUT GAIN (ON

The GAINP command sets the playback input gain level on the AUX IN input of the EF1210 to a level between 0 dB and 15 dB. This corresponds to a nominal playback signal level between 0 dBu and -15 dBu, respectivel y. For inst ance, setting GAINP to 0 corresponds to a nominal playback signal level of 0 dBu, and setting GAINP to 15 corresponds to a lower nominal playback signal level of -15 dBu.

The purpose of the playback input gain is to bring the signal level of the playback input to a constant value at the A/D inside the EF1210. For example, if we expect a 12 dBu signal at the playback input, we would set the pl ayback input gai n to 12 dB by sending the command GAINP12.

The playback input gain is set using EF1210 calibration procedures (See “Using the EF1210 Without RS-232 Control” on page 38.).

The factory default setting f or GAINP is 8 (-8 dBu = -10 dBV nominal l evel expect ed at input).

The following commands can be sent b y the r emote control device to set the p layback input gain level.

Remote Command Effects

AUX IN

INPUT

)

EF1210 Messages

Example

GAINPx Set playback input gain.

x ranges from 0 dB to 15 dB.

GAINP? Request current playback input gain.

The following messages are sent by the EF1210 in response to a GAINP? command, or in response to any GAINP command when acknowledgment mode is on.

EF1210 Message Message meaning GAINPx Playback input gain is currently x dB .

In the following example, the remote control device requests the current playback input gain of the EF1210 with Device ID number 7. Then it sets a new level on the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07GAINP? C07GAINP0 C07GAINP4 C07GAINP4

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GAINRC -

SET

REFERENCE

Remote Commands

INPUT GAIN ON REFERENCE

The GAINRc command sets the Reference input gain level on reference c of the EF1210 to a level between 0 dB and 20 dB. This corresp onds t o a nom inal Reference input signal level between 0 dBu and -20 dBu, respectively. For instance, setting

GAINR

ting GAINR 20 dBu.

The purpose of the Reference input gain is to bring the signal level of the Reference input to a constant value at the A/D inside the EF1210. For example, if we expect a 12 dBu signal at the Reference input A (AEC A), we would set the Reference input gain of Reference A to 12 dB by sending the command GAINRA12.

The Reference input gain is set using EF1210 calibration procedures (See “Calibration Step 3: Calibrating AEC Reference Inputs” on page 32.).

The factory default setting for GAINR input).

The following commands can be sent by the remote control device to set the R

ENCE

Remote Command Effects

to 0 corresponds to a nominal R eferen ce input signal level of 0 dBu , and set-

to 20 corresponds to a lower nominal Reference input sign al level of -

input gain level.

is 20 (-20 dBu nominal level expected at

EFER

EF1210 Messages

GAINR

The following messages are sent by the EF1210 in response to a GAINR mand, or in response to any GAINR

EF1210 Message Message meaning

GAINR

x Set R

c is either A or B. x ranges from 0 dB to 20 dB.

? Request current R

ence c.

Note.

The wildcard character (*) is not allow e d for specifying the channel number c for the GAINRc command.

x R

EFERENCE

dB.

EFERENCE

input gain on reference c.

EFERENCE

command when acknowledgment mode is on.

input gain on reference c is currently x

input gain on refer-

? com-

EF1210 C

OMMAND SET REFERENCE

Example

In the following example, the remote control device requests the current R input gain on reference B of the EF121 0 with Device ID numb er 7. Then it sets a new level on reference B on the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07GAINRB? C07GAINRB0 C07GAINRB4 C07GAINRB4

EFERENCE

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GAINZC -

SET

ZONE

Remote Commands

OUTPUT GAIN ON OUTPUT

The GAINZc command sets the Z a level between 0 dB and 20 dB. The output gain setting corresponds to a nominal output level that ranges from -20 dBu to 0 dBu, respe ctively. For instanc e, setting

GAINZ

makes the nominal output level 0 dBu. The factory default setting for GAINZ

The following commands can be sent by the remote control device to set the Z output gain level.

Remote Command Effects

GAINZ

to 0 makes the nominal output level -20 dBu, and setting GAINZc to 20

x Set Z

c is either A or B. x ranges from 0 dB to 20 dB.

? Request current Z

Note.

The wildcard character (*) is not allow e d for specifying the channel number c for the GAINZc command.

output gain level on ou tput c of the EF1210 to

ONE

is 12 (-8 dBu = -10 dBV).

input gain on output c.

ONE

output gain on output c.

ONE

EF1210 Messages

Example

The following messages are sent by the EF1210 in response to a GAINZ mand, or in response to any GAINZ

EF1210 Message Message meaning

GAINZ

In the following example, the remote control device requests the current Z gain on output A of the EF1210 with Device ID number 7. Then it se ts a new level on output A on the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07GAINZA? C07GAINZA0 C07GAINZA19 C07GAINZA19

x Z

ONE

command when acknowledgment mode is on.

output gain on output c is currently x dB.

? com-

input

ONE

EF1210 C

OMMAND SET REFERENCE

LOCKFP -

LOCK/UNLOCK FRONT PANEL

Remote Commands

EF1210 Messages

The LOCKFP command locks the fron t panel buttons of the EF1210 so that they have no effect.

The factory default setting for LOCKFP is 0 (unlocked).

The following commands can be sent by the remote control device to lock or unlock the front panel of the EF1210.

Remote Command Effects

LOCKFP0 Unlock the front panel buttons. LOCKFP1 Lock the front panel buttons. LOCKFP2 Toggle between locked and unlocked. LOCKFP? Request status of front panel lock.

The following messages are sent by the EF1210 in response to a LOCKFP? command, or in response to any LOCKFP command when acknowledgment mode is on.

Example

EF1210 Message Message meaning

LOCKFP0 Front panel buttons are currently unlocked. LOCKFP1 Front panel buttons are currently locked.

In the following example, the remote control device requests the status of the front panel buttons of the EF121 0 with Device ID n umber 12 . Then it locks the f ront panel on the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C12LOCKFP? C12LOCKFP0 C12LOCKFP1 C12LOCKFP1

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EF1210 U

SER MANUAL

MUTEIN -

ENABLE/DISABLE MUTE ON MICROPHONE INPUT CHANNEL

Remote Commands

The MUTEIn command mutes the microphone input channel n of the EF1210 .

The factory default setting for MUTEI

The following commands can be sent by the remote control device to mute or unmute the microphone input channel n of the EF1210.

Remote Command Effects

MUTEI

MUTEI MUTEI

MUTEI

0 Unmute microphone input channel n.

n ranges from 1 to 8.

1 Mute microphone input channel n.

2 Toggle mute on or off for microphone input chan-

nel n.

? Request mute status of microphone input channel

is 0 (not muted).

EF1210 Messages

Example

? com-

The following messages are sent by the EF1210 in response to a MUTEI mand, or in response to any MUTEI

EF1210 Message Message meaning

MUTEI MUTEI

In the following example, the remote control device unmutes all channels on the EF1210 with Device ID number 12. Then it mutes the microphone input on channel 4 and requests the mute status on channel 6 of the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C12MUTEI*0 C12MUTEI*0 C12MUTEI41 C12MUTEI41

0 Mute is disabled on microphone input channel

1 Mute is enabled on microphone input channel n.

Note.

It is possible to use a wildcard (*) for setting MUTEIn to 0 or 1 (turning on/off), but not for querying or toggling.

command when acknowledgment mode is on.

C12MUTEI5? C12MUTEI50

EF1210 C

OMMAND SET REFERENCE

NCN -

ENABLE/DISABLE NOISE CANCELLATION ON CHANNEL

Remote Commands

The noise cancellation feature improves the signal-to-noise ratio of the incoming

microphone speech by either 6 or 10 dB. The NC feature on the channel specified. The NCL noise cancellation. Noise cancellation is applied to each microphone channel.

The factory default setting for NC

The following commands can be sent by the remote control device to enable or disable noise cancellation on channel n.

Remote Command Effects

0 Turn off noise cancellation on channel n.

n ranges from 1 to 8.

1 Turn on noise cancellation on channel n.

2 Toggle noise cancellation on or off on channel n.

? Request status of noise cancellation on channel n.

is 1 (on).

command enables or disables this

command selects between 6 and 10 dB of

EF1210 Messages

Example

The following messages are sent by the EF12 10 in r esponse to an NC in response to any NC

EF1210 Message Message meaning

0 Noise cancellation is currently off on channel n.

1 Noise cancellation is currently on on channel n.

In the following example, the remote control device turns noise cancellation off on all channels on the EF1210 with Device ID number 12. Then it turns noise cancellation on on channel 1 and requests the noise cancellation status on channel 5 of the same EF1210. Acknowledgment mode is enabled.

Note.

Remote Command EF1210 Message

C12NC*0 C12NC*0 C12NC11 C12NC11

It is possible to use a wildcard (*) for setting NCn to 0 or 1 (turning on/off), but not for querying or toggling.

command when acknowledgment mode is on.

? command, or

C12NC5? C12NC50

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SER MANUAL

NCL

SET NOISE CANCELLATION LEVEL ON CHANNEL

Remote Commands

EF1210 Messages

The noise cancellation feature improves the signal-to-noise ratio of the incoming

microphone speech by either 6 or 10 dB. The NC feature on the channel specified. The NCL noise cancellation. Noise cancellation is applied to each microphone channel.

The factory default setting for NCL

The following commands can be sent by the remote control device to change the noise cancellation level.

Remote Command Effects

x Set noise cancellation level on channel n to x.

NCL

n ranges from 1 to 8. x is either 6 dB or 10 dB.

NCL

? Request current noise cancellation level on channel

The following messages are sent by the EF1210 in response to an NCL or in response to any NCL

command when acknowledgment mode is on.

is 10 (normal).

command enables or disables this

command selects between 6 and 10 dB of

? command,

Example

EF1210 Message Message meaning

NCL

x The noise cancellation level on channel n is x.

x is either 6 dB or 10 dB.

In the following example, the remote control device sets the noise cancellation level to 10 dB on all channels on the EF1210 with Device ID number 12. Then it requests the noise cancellation status on channel 5 and sets the noise cancellation level on channel 7 to 6 dB of the same EF1210. Acknowledgment mode is enabled.

Note.

Remote Command EF1210 Message

C12NCL*10 C12NCL*10 C12NCL5? C12NCL510 C12NCL76 C12NCL76

It is possible t o us e a w i ld car d (*) for setting NCLn to 6 or 10, but not for querying.

EF1210 C

OMMAND SET REFERENCE

PING -

SEE WHICH DEVICES ARE PRESENT

Remote Commands

EF1210 Messages

The PING command “pings” all of the devices on the ASPI Bus to find out what is connected to it. Each device will respond with a PONG message, which contains its device type and device ID. This lets you know how many of each type of device are connected, and what device ID they have.

Generally, the PING command should be used with asterisks to query all devices, or devices of a certain type. For example, ***PING queries all devices on the bus, while C**PING queries all EF1210s on the bus.

The following command can be sent by the remote control device to find out what devices are connected to the ASPI Bus.

Remote Command Effects PING Requests a PONG message from the device.

The EF1210 never sends a PING message, but will send a PONG mess age in r espons e to one (see PONG).

Example

In the following example, the remote control device requests a PONG message from all EF1210s on the ASPI Bus. Two EF1210s respond.

Remote Command EF1210 Message

***PING C07PONG

A18PONG A12PONG C12PONG C14PONG

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REFASGN

- AEC

EF1210 U

SER MANUAL

REFERENCE ASSIGNMENT

The REFASGNnc command assigns reference c to input channel n of the EF1210.

The factory default setting for REFASGN

is A (Reference Input A).

Remote Commands

EF1210 Messages

The following commands can be sent by the remote control device to change the reference channel assignment.

Remote Command Effects

REFASGN

The following messages are sent by the EF1210 in response to an REFASGN mand, or in response to any REFASGN on.

EF1210 Message Message meaning

REFASGN

Note.

c Assign reference c to channel n.

c ranges either A or B. n ranges from 1 to 8.

? Request reference assignment of channel n.

The wildcard character (*) is not allow e d for specifying the channel number n for the REFASGNnc command.

command when acknowledgment mode is

Reference c is assigned to channel n. c is either A or B. n ranges from 1 to 8.

? com-

Example

In the following example, the remote control device requests the reference channel assigned to channel 1 and channel 2 on the EF1210 with Dev ice ID number 7. T hen it assigns Reference A to channel 2 of the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07REFASGN1? C12REFASGN1A C07REFASGN2? C12REFASGN2B C07REFASGN2A C12REFASGN2A

EF1210 C

OMMAND SET REFERENCE

RESETF -

RESTORE ALL SETTINGS TO FACTORY DEFAULT

Remote Commands

EF1210 Messages

The RESETF command causes all the EF1210 settings to be restored to the factory default. This command does not save the settings to non- volatile memory, but you can follow the RESETF command with a SAVENV command to do this. The variables that are restored as a result of this command are listed at the end of this section. Refer to “Default Values and Saved Parameter List” on page 84

The following command can be sent by the remote control device to restore the EF1210 to the factory defaults.

Remote Command Effects RESETF Change all the settings back to their factory

defaults.

The EF1210 sends a RESETF message in response to a command, after it sends status messages for each of the settings that were changed by the restore operation, if

acknowledgment mode is enabled.

Example

EF1210 Message Message meaning RESETF The EF1210 has finished restoring the factory

defaults.

In the following example, the remote control device restores the factory default settings of the EF1210 with Device ID number 12. The EF1210 sends back messages notifying the remote control device that the parameters have been reset to the factory standards.

Remote Command EF1210 Message

C12RESETF C12RESETF

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SER MANUAL

RESTNVM -

RESTORE SETTINGS FROM NON-VOLATILE MEMORY IN MEMORY SLOT

Remote Commands

The RESTNVm command restores the EF1210’s settings to the user (power-up) defaults stored in the non-volatile memory. This is useful for putting the EF1210 in its “normal” configuration after someone has changed the settings for a particular

call. See the SAVENV non-volatile memory.

When the RESTNVm command is sent to the EF1210 by the host, the restore process begins. When the restore process is complete, the EF12 10 sends the RESTNVm mes sage back to the host as an acknowledgment. The variables that are saved as a result of this command are listed at the end of this document. Refer to “Default Values and Saved Parameter List” on page 84

It is possible to restore one of four (0 - 3) previously saved confi g urat ion s fro m memory. See the SAVENVm command for a discussion of this feature.

The following command can be sent by the remote control device to restore the EF1210 to the user defaults.

Remote Command Effects

RESTNV

command for information about saving the user defaults in

Restore settings from non-volatile memory slot m. m ranges from 0 to 3.

EF1210 Messages

Example

The EF1210 sends a RESTNVm message in response to a command after the restore process is complete, if acknowledgment mode is enabled.

EF1210 Message Message meaning

RESTNV

In the following example, the remote control device restores the default settings of the EF1210 with Device ID number 12. The EF1210 sends back messages notifying the remote control device that the parameters have been reset to the default set tings.

Remote Command EF1210 Message

C12RESTNV0 C12RESTNV0

Settings have been successfully restored from nonvolatile memory slot m. m ranges from 0 to 3.

EF1210 C

OMMAND SET REFERENCE

SAVENVM -

SAVE CURRENT SETTINGS TO NON-VOLATILE MEMORY IN MEMORY SLOT

The SAVENVm saves the EF1210’s current settings to non-volatile memory. These settings will be used as the default settings each time the EF1210 is powered on. The

default settings may also be restored by sending the RESTNV Please note that audio may drop out for a second while the EF1210 writes to non-vol-

atile memory. Normally, the SAVENV process, when a conversation is not taking place.

Once the SAVENVm command is sent from the h ost to t he EF 12 10, th e save p roces s begins. When the save process is completed, the EF1210 sends the SAVENVm command back to the host as an acknowledgment. The variables that are saved as a result of this command are listed at the end of this document. Refer to “Default Values and Saved Parameter List” on page 84.

There are 4 storage locations for saving settings. These can be used to store different user configurations. When the EF1210 boots up, it loads the settings from slot 0. In other words, whatever settings you save to slot 0 will be restored every time you reset the EF1210. This provides a way of setting the power-on def aults. Also, eve ry time you perform a front-panel setup, the results of the setup are saved to slot 0. This is done so that you don’t have to set up the EF1210 every time you lose power.

command is used during the configuration

command.

Remote Commands

EF1210 Messages

Example

The following commands can be sent by the remote control device to save the current settings in non-volatile memory.

Remote Command Effects

SAVENV

The EF1210 sends the following message in response to a SAVENVm command, if acknowledgment mode is enabled.

EF1210 Message Message meaning

SAVENV

In the following example, the remote control device saves the settings of the EF1210 with Device ID number 12 in memory slot 0

Remote Command EF1210 Message

Save settings to non-volatile memory slot m. m ranges from 0 to 3.

The settings were successfully saved to non-volatile memory slot m. m ranges from 0 to 3.

C12SAVENV0 C12SAVENV0

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SELECTIN -

SET FRONT PANEL

Remote Commands

EF1210 Messages

INPUT

The SELECTIn command sets the front panel I of the EF1210.

The factory default setting for SELECTIn is 1 (input channel 1).

The following commands can be sent by the remote control device to set the front panel I

Remote Command Effects

SELECTI

SELECTI? Request current assignment of front panel I

The following messages are sent by the EF1210 in response to a SELECTI? command, or in response to any SELECTI on.

meter to display input channel n.l

NPUT

METER TO DISPLAY INPUT CHANNEL

meter to di splay inpu t cha nnel n

NPUT

Set front panel I nel n. n ranges from 1 to 8.

meter.

meter to display input chan-

NPUT

command when acknowledgment mode is

NPUT

Example

EF1210 Message Message meaning SELECTIn Front panel I

input channel n.

In the following example, the remote control device requests the current channel displayed on the I channel 5 to be displayed on the I mode is enabled.

Remote Command EF1210 Message

C07SELECTI? C07SELECTI1 C07SELECTI5 C07SELECTI5

meter of the EF1210 with Device ID number 7. Then it sets

NPUT

meter is currently set to display

NPUT

meter of the same EF1210. Acknowledgment

EF1210 C

OMMAND SET REFERENCE

SELECTRC -

SET FRONT PANEL

Remote Commands

EF1210 Messages

REMOTE

The SELECTRc command sets the front panel R input channel c of the EF1210.

The factory default setting for SELECTRc is A (Reference A).

The following commands can be sent by the remote control device to set the front panel R

Remote Command Effects

SELECTR

SELECTR? Request current assignment of front panel R

The following messages are sent by the EF1210 in response to a SELECTR? command, or in response to any SELECTR on.

meter to display reference input channel c.l

EMOTE

METER TO DISPLAY REMOTE INPUT CHANNEL

meter to display reference

EMOTE

Set front panel R input channel c. c is either A or B.

meter.

meter to display reference

EMOTE

command when acknowledgment mode is

Example

EF1210 Message Message meaning

SELECTR

In the following example, the remote control device requests the current reference channel displa yed on the R Then it sets channel 5 to be displayed on the R Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07SELECTR? C07SELECTR1 C07SELECTR5 C07SELECTR5

Front panel R play reference input channel c.

meter of the EF1210 with Device ID number 7.

EMOTE

meter is currently set to dis-

EMOTE

meter of the same EF1210.

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 79

CHANGE THE SAMPLE RATE

SR -

EF1210 U

The SR command changes the sample rate of the EF1210. SR16 (16 kHz) is the normal operati ng mode of the EF1210. The wi deband (SR48,

48 kHz) mode is provided for applications that require high-fidelity noise cancellation. In the wideband mode, acoustic echo cancellation is disabled but the noise cancellation continues to function.

The factory default setting for SR is 16 (norma l sampling rate).

SER MANUAL

Remote Commands

EF1210 Messages

The following commands can be sent b y the r emote c ontro l dev i ce to chan ge th e sample rate of the EF1210.l

Remote Command Effects

SR16 Change to normal (16 kHz) sampli ng rate. SR48 Change to wideband (48 kHz) sampling rat e. SR? Request current sampling rate.

The following messages are sent by the EF1210 in response to a SR? com mand, or in response to any SR command when acknowledgment mode is on.

EF1210 Message Message meaning SR16 The EF1210 is currently running at its normal (16

kHz) sampling rate.

SR48 The EF1210 is currently running in wideband (48

kHz) mode.

Example

In the following example, the remote control device requests the current sampling rate of the EF1210 with Device ID number 7. Th en it c hang es th e sampl ing rat e to 48 kHz of the same EF1210. Acknowledgment mode is enabled.

Remote Command EF1210 Message

C07SR? C07SR16 C07SR48 C07SR48

EF1210 C

OMMAND SET REFERENCE

SWVER -

REQUEST SOFTWARE VERSION

Remote Commands

EF1210 Messages

The SWVER command requests the software version of the EF1210.

The following commands can be sent by the remote control device to req uest the software version of the device.

Remote Command Effects SWVER? Request the software version of the EF1210.

The following message is sent by the EF1210 in response to a SWVER? command, indicating its software version.

EF1210 Message Message meaning SWVERxx.yy The EF1210 software version is xx.yy.

xx denotes a major revision. yy denotes a minor revision.

Example

In the following example, the remote control device requests the software version of the EF1210 with Device ID number 12.

Remote Command EF1210 Message

C12SWVER? C12SWVER1.00

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EF1210 U

SER MANUAL

ERROR# -

ERROR MESSAGE

Remote Commands

EF1210 Messages

Example

The error messages report errors that the EF1210 encounters. These are usually command syntax errors. The errors are numbered, and the meaning of each error number is described below. Error messages are enabled or disabled with the ERROR com- mand and must be enabled for this message to be sent.

The ERROR# command should not be sent to the EF1210. It’s only used as a message from the EF1210.

The following messages are sent by the EF1210 when it has an error.

EF1210 Message Message meaning

ERROR#01 Unknown command. ERROR#02 Invalid command data.

In the following example, the remote control device tries to send a few invalid commands to the EF1210 with Device ID 6. The EF1210 returns an error message in response to each of these commands. Error messages are enabled.

Remote Command EF1210 Message

C06CHEESE C06ERROR#01 C06PHONE@#$% C06ERROR#02

EF1210 C

OMMAND SET REFERENCE

PONG -

DEVICE RESPONSE TO

Remote Commands

EF1210 Messages

Example

PING

The PONG message is sent by the EF1210 in response to a PING command. This can be used by the remote control device to find out what device IDs are used by EF1210s. Also, see the PING command.

The EF1210 will not recognize the PONG command. You should only send the PING command from a remote control device.

The following message is sent by the EF1210 when the remo te control d evice sends it a PING command.

EF1210 Message Message meaning PONG Response from EF device.

In the following example, the remote control device sends the PING command to find out what EF devices are on the bus. One EF1210 and one EF200 returns a PONG message to announce their presence. Acknowledgment mode is enabled.

COMMAND

Remote Command EF1210 Message

C**PING C06PONG

A17PONG

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EFAULT VALUES AND SAVED PARAMETER LIST

EF1210 U

SER MANUAL

Note.

Parameter Default Value

ACKMOD 1 (on) AEC

AECS ERROR 1 (on) GAINC 12 (-8 dBu = -10 dBV) GAINI GAINP 8 (-8 dBu = -10 dBV) GAINR GAINZ LOCKFP 0 (unlocked)

MUTEI

Parameters that are in

RESETF, RESTNV

1 (on); n ranges from 1 to 8.

0 (normal); n ranges from 1 to 8.

0 (0 dBu); n ranges from 1 to 8.

20 (-20 dBu); c is either A or B. 12 (-8 dBu = -10dBV); c is either A or B.

0 (not muted); n ranges from 1 to 8. 1 (on); n ranges from 1 to 8.

bold

SAVENV

, or

print indicate those affected b y a

command.

NCL

REFASGN

SELECTI SELECTR

SR 16 (normal sampling rate)

n c

10 (normal); n ranges from 1 to 8. A (Reference Input A); n ranges from 1 to 8. 1 (Input Channel 1); n ranges from 1 to 8. A (Reference Input A); c is either A or B.

PPLICATIONS

ISTANCE LEARNING

Instructor

microphone

(Push to Talk)

Student microphones

ZONE A AEC A

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

CH 8

REC

RS-232

EF1210

AUX

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

Auto

Mixer

Logic Port

TO AEC

FROM AEC

REMOTE

EF200

(Optional)

REMOTE

PSTN

FROM

CODEC

Camera

auto-reverse

TAPE RECORDER

12:00

VCR

Figure 17. Distance Learning using the EF1210

Distance learning classrooms are usually made up of the components shown in Figure 17, which include the EF1210 and the EF200 Phone Add.

Logic in/out for a video camera to turn to the student talker should be imp lemented on the logic port of the au to mi xer. Micr ophon e muting shou ld likewi se be implemen ted using the logic port of the auto mixer or muted by remote control on the EF1210 line levels outputs. We recommend this so that the microphone is muted at the line outputs of the EF1210 or the input of the automixer, which allows the microphone input to still be processed by the echo canceller in the EF1210. A useful option would be to provide the instructor with an RS-232 remote control dev ice that will allow the instructor to mute student microphones using the EF1210 command set.

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OURTROOMS

EF1210 U

SER MANUAL

ZONE A AEC A

CH 1

CH 2

CH 3

CH 4

CH 5

CH 6

CH 7

CH 8

RS-232

EF1210

REC

AUX

Well

Jury

Gallery

Judge

Plaintiff

Defendant

Witness

Podium

Clerk

Jury

Figure 18. Court Rooms using the EF1210

In courtroom applications, the Zone outp ut should be mixed with all input microphone channels in the auto mixer to be output to an amplifier or powered loudspeakers. A typical courtroom setup may include microphones for the judge, plaintiff, defendant, etc. as well as at least 3 separate loudspeaker outputs that go to the well, the jury and the gallery. You can allow the judge to mute microphones through the RS-232 control on the EF1210 or through the logic port on the automixer. For recording, use the direct output for each microphone on the auto mixer to ou tput to an 8-channel recorder.

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

Auto

Mixer

Line Output

Logic Port

Output

Direct

TO AEC

EF200

(Optional)

FROM

8-Channel Recorder

AEC

PSTN

FROM

REMOTE

CODEC

URTHER ASSISTANCE

For other system configurations or design assistance, please contact ASPI Digital at:

Application Engineering ASPI Digital 1720 Peachtree St. NW, Suite 220 Atlanta, GA 30309-2439

Phone: (404) 892-3200 Fax: (404) 892-2512 Email: help@aspi.com

EF1210 B

LOCK DIAGRAM

EF1210 B

Output 5 Output 6 Output 7 Output 8

Zone 2

Line Out

Zone 1

Line Out

Line Line Line Line

Line

LOCK DIAGRAM

Link

RS-232

D/A

Ref. Select

D/A

ECNC

A/D

Level

+ +

adjust

Mic/Line

Phantom

Mic/Line

Phantom

Mic/Line

Phantom

Line

Line Mic/Line

Gain

Mic/Line 8

Mic/Line 7

Mic/Line 6

Mic/Line 5

AEC

Reference

AEC

Reference

Aux

Mute

Line Line Line

Output 1 Output 2 Output 3 Output 4

Line

Figure 19. Inside the EF1210

D/A

ECNC

A/D

Level

adjust

Gain

Mic/Line

Phantom

Mic/Line

Phantom

Mic/Line

Phantom

Mic/Line

Phantom

CODEC

Amix

Rec

Mic/Line 4

Mic/Line 3

Mic/Line 2

Mic/Line 1

Noise

Cancellation

Echo

Canceller

To Zone Output

To AEC

ECNC (Echo Canceller, Noise Cancellation)

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 87

ONNECTOR PINOUTS

ASPI Bus

EF1210 U

SER MANUAL

ASPI BUS IN

ASPI BUS OUT

REMOTE CONTROLREMOTE CONTROL

RS-232

5, 15 VDC 5, 12 VDC

The ASPI Bus uses RJ45 connectors. These should be used with category five twisted-pair cable. The total distance of the ASPI Bus should be less than 20 m.

RS-232 Port (9600 8-N-1)

The RS-232 port is wired as DCE. It accepts a male DB-9 connector. Only pins 2, 3, and 5 are required by the EF1210. Connect pins straight through (do not use null modem). 1 DCD; 2 TXD; 3 RXD 4 DSR; 5 ground; 6 DTR; 7 CTS; 8 RTS; 9 No connection

Power Supply Inpu t

The power supply input accepts a 5-pin DIN male connector. Only use the power supply provided by ASPI Digital. Use of other power supplies will void the warranty.

1 Ground; 2 Ground; 3 +5Vdc @ 3 A; 4 -15Vdc @

0.3 A; 5 +15Vdc @ 1.2 A

Mic/Line Inputs, A Mix In, Aux, AEC Ref, Line Outputs, Rec, To CODEC, Zone Outputs

These audio connectors accept a mini (3.5 mm) 3 conductor terminal block (provided). See Note below for manufacturer information. From left to right the conductors are positive signal, negative signal, and shield ground .

To avoid ground loops , do not co nnect shield g round at both ends of the cable (except to microphones — ground is requ ired at both ends for phantom power).

ONNECTOR PINOUTS

Note

The informati on b el ow l ist s manufacturer infor mat i on for the Phoenix connect o r that we use:

Manufacturer: Phoenix Contact Description: Mini-COMBICON 3-position plug, 3.5 mm pitch Type Number: MC 1.5/3-ST-3.5 or MC 1,5/3-ST-3,5 Part Number: 1840379

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EF1210 U

SER MANUAL

ONNECTING BALANCED EQUIPMENT TO UNBALANCED EQUIP

MENT

ONNECTING UNBALANCED

RCA TO B

RCA Male

Tip

Red

Black

Ring

Figure 20. Cable co nstruction for connect ing unbala nced RCA to b alanced mini Phoenix (3 co nductor t erminal block).

1. Connect RCA Tip to Phoenix pin 1.

2. Connect RCA Ring to Phoenix pin 2.

3. Connect Phoenix pin 3 to Shield, and leave Shield floating on RCA end.

ALANCED MINI PHOENIX

Mini (3.5 mm) Phoenix

Red Black Shield

1 2 3

Caution! Caution!

Do NOT connect the shield at both ends. On the EF1210, Phoenix pin 3 is connected to chassis ground. Under no circum-

stances should Phoenix pin 3 be connected to pin 1 or to pin 2. Doing so will add noise to the audio signal.

CHOFREE

™ EFP C S U

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 A-1

ANEL

ONTROL

OFTWARE

SER

ANUAL

ASPI Digital - The Sound of DSP 1720 Peachtree Street NW, Suite 220 Atlanta, GA 30309-2439 (404) 892-3200 www.echofree.com

Technical Support: (404) 892-3200 help@aspi.com

EFPanelUM-0100-99

BOUT

EFP

ANEL CONTROL SOFTWARE

BOUT

NSTALLING

ETTING STARTED

EFP

ANEL CONTROL SOFTWARE

ANEL

Install EFPanel by copying the executable (EFPanel.exe) onto your hardrive. Connect an RS-232 cable (see the EF1210 User Manual or the EF200 User Manual

for connector pinouts) from the COM port on your computer to the RS-232 port on the EF device. If you would like to control more than one EF device in your system, use a category five twisted pair cable to connect the devices using the ASPI Bus.

Note.

After installing EFPanel, start the executable. When the program is first started, you may initially only see 3 tabs on the application — the Serial Port, Traffic and About pages. Go to the Serial Port page by clicking on the tab labeled Serial Port. Choose the appropriate COM port for your computer.

This control software and manual may be changed and updated periodically, so please visit our website at http://www.aspi.com for

the most recent versions.

ANEL FEATURES FOR ALL

EFP

EF D

The following feature description s apply to EFPanel for all EF Devices. Following this section are discussions of specific features that pertain only to specific EF Devices.

EVICES

ASPI Digital -

The Sound of DSP

Technical Support: 404.892.3200 A-3

EF Device Selector

EF1210 U

SER MANUAL

Serial Port Page

Traffic Page

About Page

Figure 21. EF Device Selector on EFPanel

This selector has two purposes:

1. It displays a list of all EF Devices that are connected together via the ASPI Bus.

2. It allows you to choose another EF Device to control.

Allows you to choose the COM port that you are using on your computer.

Shows commands that are sent and received from the EF device.

Displays version of EFPanel Control Software, as well as version of code in the EF device.

THE EF1210 O

PTIONS PAGE

THE EF1210 O

PTIONS PAGE

Figure 22. EF1210 Options Page on EFPanel

1. F

ILE MENU

. This menu gi ves you options to load and save different saved configurations. You can open or save a con figuration to a file, r estore factory d efault settings, or restore a configuration from non-volatile mem ory.

2. O

PERATING MODE

. Allows you to choose between two modes: Echo and Noise Cancellation mode and Wideband Noise Cancellation mode. When the EF1210 is in Wideband Noise Cancellation mode, the AEC on every input channel is disabled.

3. S

IGNAL METERS

panel I on the R

4. V

OLUME ADJUST

NPUT SIGNAL LEVEL INDICATOR

EMOTE SIGNAL LEVEL INDICATOR

. Choose which input channel is displayed on the EF1210 front

and which Reference input is displayed

. Allows you to adjust volumes on Zone ou tputs, Playback and

To CODEC levels.

5. S

ETUP BUTTON

. This button will put the EF1210 in setup mode and disp lay the

first page used for calibration.

6. EF D

EVICE SELECTOR

. This option shows all the EF devices that are connected

via the ASPI Bus and also allows you to choose another EF device to control.

7. F

RONT PANEL LOCKOUT

. This option locks the front panel so that any button

pushed on the EF1210 will have no effect.

8. EF1210 C

ALIBRATION STEP INDICATOR

. Each block in this indicator indicates a

ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 A-5

EF1210 U

SER MANUAL

different calibration step. For each calibration step, the appropriate block will light up in blue.

9. P

ER CHANNEL OPERATION

. This section allows you to set the noise cancellation, set suppression mode, mute input channels, and turn the AEC on or off either individually, or applied to all channels at the sam e tim e.

ALIBRATING THE

EF1210

WITH

EFP

ANEL CONTROL SOFTWARE

ALIBRATING THE

To Start EF1210 Calibration

ALIBRATION STEP

EF1210

Note.

If you would like to exit Setup mode at any time, click on the Cancel button. All original settings before you entered S e tup will be restored.

As you calibrate the EF1210, y ou can use th e EF1210 Calibra tion S the EFPanel Toolbar (see Figure 22 on page 5) to help keep track of which calibration mode you are in.

Click on the Setup button (see Fi gure 22 on page 5) to enter configur at io n mode of the EF1210.

ALIBRATING MICROPHONE

1: C

For Calibration Step 1, the S

WITH

To calibrate the EF1210 using the EFPane l control software, you need to be able to see the EF1210 front panel LED meters .

EFP

ANEL CONTROL SOFTWARE

TEP INDICATOR

NPUT CHANNELS

will be lit in the first position.

TEP INDICATOR

ASPI Digital -

i. Select pink noise output source. This is the Zone that will output pink noise for

The Sound of DSP

Figure 23.

microphone calibration.

Calibration Step 1: Calibrat ing Microphone Inputs

Technical Support: 404.892.3200 A-7

EF1210 U

SER MANUAL

• The default choice is pink noise played in both Zone A and Zone B.

• Choose “No noise generated” for no pink noise in Zone A and Zone B.

• Choose “Pink noise to Zone A” for pink noise in Zone A.

• Choose “Pink noise to Zone B” for pink noise in Zone B.

ii. Select input channel to calibrate. iii. You will need a Sound Level Meter (SPL Meter) for this step. Adjust micro-

phone and loudspeaker to attain the appropriate dB SPL at the microphone using the following steps:

• Set the SPL meter to C weighted, slow response. Choose the appropriate dB

SPL range using Table 7 below based on microphone type and the talker’s distance from the microphone.

Table 7: Typical distance from microphone to talker and appr opr i ate d B SP L l evel .

ICROPHONE TYPE

YPICAL DISTANCE FROM

ALKER (FT

SPL L

(dB)

EVEL

Lavalier 6 inches to 1 foot 89 dB SPL

Gooseneck 1-2 feet 77 dB SPL

Boundary or other tabletop 2-3 feet 73 dB SPL

Ceiling 4 or more feet 69 dB SPL

• Place the SPL meter beside the microphone. Point the SPL meter and the

microphone toward the loudspeaker.

• Adjust the microphone/l oudspeaker so that a nominal dB SPL level based on

Table 7 is registered at the microphone.

Note.

Always double check the microphone level with normal speech once the microphones are in normal operating position. Actual

speech levels may vary depending on room reverberation, etc. Verify that you set a reasonable level (three green LEDs and one solid yellow LED, or 0 dB) by actually ta lking and looking at the meter.

iv. Adjust level until the first yellow LED (0 dB) on the I

of the EF1210 front panel is lit.

ETER

NPUT SIGNAL LEVEL

v. Repeat for each input channel or click the Apply Gain to All button to

apply the Input Gain to all input channels. Return all microphones to their normal operating location and orientation.

Note.

It is vital to move the SPL meter and/or microphones so that each microphone sees the correct dB SPL acoustic level as you are cal-

ibrating. Do not assume that because the first microphone sees the dB SPL level, all other microphones will see the same level (unless they are moved to occupy the same location as the first).

Note.

Use caution if the microphones lie in two acoustically sep ar at e d zones and you are only calibrating one zone. As you cycle throug h

microphones that lie in the other zone, no activity will be indicated on the I

NPUT SIGNAL LEVEL METER

on the EF1210 front panel.

vi. After all input channels have been calibrated, press the Next button at the bot-

Polycom EF1210 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual