Polycom VORTEX EF2280 User Manual

Vortex EF2280 Reference Manual

VORTEX EF2280 REFERENCE MANUAL

Introduction....................................................................................................2

Product Features .................................................................................................... 3

Pre-Installation...............................................................................................4

EF2280 Front and Rear Panels.............................................................................. 5

Installation .....................................................................................................7

Mounting the EF2280 ............................................................................................. 7

Connecting the EF2280 to Other Equipment ......................................................... 7

Device IDs on the EF Bus....................................................................................... 9

Connecting Multiple EF2280s................................................................................ 9

Factory Default Settings (Preset 0) ........................................................................ 11

Check Surrounding Equipment............................................................................... 13

Integrating the EF2280 Into Your System.....................................................15

Input Settings .......................................................................................................... 15

Calibration.............................................................................................................. 15

Build Your Echo Canceller Reference.................................................................... 17

Echo Canceller Reference for Multiple EF2280s................................................... 18

Configure the Automatic Microphone Mixer.......................................................... 20

Automixer Settings for Multiple EF2280s .............................................................. 22

Configure the Matrix Mixer.................................................................................... 23

Building Your System with Multiple EF2280s........................................................ 23

Presets..................................................................................................................... 25

Other EF2280 Features.......................................................................................... 25

LCD Menu Structure .....................................................................................26

System Menu ........................................................................................................... 29

Inputs ...................................................................................................................... 30

Outputs.................................................................................................................... 31

Automixer Menu...................................................................................................... 32

Matrix Menu ........................................................................................................... 34

Parametric EQ Menu.............................................................................................. 35

Troubleshooting .............................................................................................36

Automatic Microphone Mixer................................................................................. 36

Matrix Mixer........................................................................................................... 37

Echo Canceller Reference ...................................................................................... 37

Residual Echo ......................................................................................................... 37

Contacting Technical Support ................................................................................ 42

Technical Specifications ................................................................................43

Compliance............................................................................................................. 43

Conference System Design............................................................................46

EF2280 Block Diagram .................................................................................47

Connector Pinouts..........................................................................................48

Connecting Unbalanced RCA to Balanced Mini Phoenix...................................... 50

Making an EF Bus Terminator............................................................................... 50

Additional Notes ..................................................................................................... 51

Warranty Information ....................................................................................52

Definition of Terms .......................................................................................54

Index ..............................................................................................................57

NTRODUCTION

Welcome Congratulations on your purchase of the Vortex EF2280!

INTRODUCTION

How to Use This Manual

This is a reference manual for your EF2280. It is structured to provide the information you need quickly and conveniently. The following is an overview of each section:

• Introduction

• Conference System Design gives suggestions on topics to consider when design-

ing your system.

• Pre-Installation includes information about the contents of the box, tools needed for installation and front and rear panel descriptions.

• Installation covers connections of inputs/outputs and calibration of inputs of the EF2280.

• Integrating the EF2280 Into Your System describes adjustments to take into consideration when integrating the EF2280 with surrounding equipment in your system.

•LCD Menu Structure describes an overview of the LCD menu structure and also gives a system overview of features and options available.

• Troubleshooting helps to debug problems with installation.

• Technical Specifications provides the technical specifications of the EF2280.

• EF2280 Block Diagram shows the inside of the EF2280.

• Connector Pinouts shows pinout diagrams for EF2280 input and output connec-

tors.

• Warranty Information

• Definition of Terms explains terms used in this manual, as well as terms used in

our technology of echo cancellation, noise cancellation, and audio conferencing.

About the EF2280 The EF2280 is a 12-input, 12-output, 8-channel acoustic echo and noise canceller

with matrix mixing and automatic microphone mixing capabilities. It includes a total of 12 analog inputs (8 mic/line level inputs and 4 line level inputs), 12 analog outputs, and 4 digital expansion busses. Acoustic echo cancellation (AEC) and noise cancellation can be applied to each of the 8 mic/line level inputs, and each of these inputs can then be sent to one of the two internal automatic microphone mixers. The system also contains a 25 x 18 main matrix, and four 7 x 3 submatrices. The 25 x 18 main matrix has the following inputs: input channels 1-8 (gated or ungated), input channels A-D, the internal signal generator, and 3 mixes of each of the four digital busses (3 mixes times 4 busses equals 12 inputs). The 25 x 18 main matrix has the following outputs: outputs 1-8 and A-D, AEC reference 1 and 2, and W, X, Y, and Z outputs to the digital expansion bus. The EF2280 has 24 bit resolution, 32-bit floating point computation, and a 48 kHz sampling rate.

Polycom’s proprietary noise cancellation on each of the 8 mic/line inputs helps to keep overall ambient noise to a minimum. Polycom echo cancellers are the only ones on the market to feature this patent pending technology. Noise cancellation filters out ambient background noise such as noise from heating, ventilating and air conditioning (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

VORTEX EF2280 Reference Manual 2 Technical Support: 800.932.2774

INTRODUCTION

improves the sound quality of an automixer, for example, by preventing 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 signal to noise ratio (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.

Warranty Registration

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 and will allow us to notify you with updated product features and software.

PRODUCT FEATURES

Product • Front panel LCD for controlling and configuring the product without a computer

• 5-band equalizer on all Inputs and Outputs (Parametric, High/Low Pass, High/ Low Shelf)

• Echo cancellation on Inputs 1-8

• Noise cancellation up to 15 dB

• Two internal automatic microphone mixers for Inputs 1-8

• 25 x 18 full cross point matrix mixer with expansion bus

• Internal signal generator for calibration mode and noise masking applications

• 2 year warranty

AEC • 24 bit resolution

• 48 kHz sampling rate, >20 kHz bandwidth

• 270 ms AEC tail length

• 40 dB/sec convergence rate

• Can function in rooms with more than 10 dB of room gain

Inputs and Outputs • 8 microphone/line level inputs with phantom power on each input

• 24 VDC Phantom Power

• 4 line level auxiliary inputs with nominal level of 0 dBu

• 12 digitally controlled analog trimpots for the 12 input signals

• 12 line level outputs with default nominal level of 0 dBu

• Automatic Gain Control (AGC) on Inputs 1-8.

• Phoenix connectors for audio input and output

Remote Control • RS-232 port for remote control

• Reconfigurable parallel logic input/output

• ASPI bus for controlling multiple EF devices from a single controller

• EF bus for linking multiple EF2280s.

• Digital bus with 4 audio busses, 48 kHz sampling rate

• Up to 8 devices can be linked, each device providing 4 audio signals on the bus

PRE-INSTALLATION

PRE-I

NSTALLATION

What’s Included The Vortex EF2280 product package includes the following items:

• Vortex EF2280 Reference Manual

• Vortex EF2280

• External power supply

• Cat 5 cable for EF Bus or ASPI Bus

• EF Bus terminator

• Rack mount screws (4)

• Phoenix connectors (24)

• Cable clamp and screw

• CDROM containing other manuals and Conference Composer software

• Warranty Registration Card

Rackmount

Phoenix

Connectors (24)

Screws (4)

EF Bus

Terminator

Vortex® EF2280

CDROM with

control software and manuals

Vortex® EF2280

Reference Manual

Cable Clamp

and screw

External

Power Supply

1-Cat 5 cable (6 inches)

for EF

Bus

or ASPI Bus

Vortex EF2280 Reference Manua l

Figure 1. What’s Included with your Vortex EF2280.

What’s Not Included The following equipment is not included with the EF2280 product package, but may

be necessary to create a completely functional system:

• Microphones

• Loudspeakers

• Audio amplifier (or amplified loudspeaker)

• EF200 Phone Add

• Audio cables

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

• RS-232 remote control device (optional)

Tools Needed for Installation

• Screwdriver to mount the EF2280 in your rack.

• Phoenix connector screwdriver

VORTEX EF2280 Reference Manual 4 Technical Support: 800.932.2774

PRE-INSTALLATION

EF2280 F

RONT AND REAR PANELS

134 5 7

10 1211 15 16 17 18 19

9 1413

2 86

Figure 2. EF2280 Front and Rear Panels

1. LCD DISPLAY. Displays menu instructions for configuration and operation of the EF2280.

2. D decreases the value of a parameter.

3. U the value of a parameter.

4. E

5. E

6. H

7. L

8. C inputs.

OWN BUTTON. Scrolls backward through menu items at a particular level or

P BUTTON. Scrolls forward through menu items at a particular level or increases

NTER. Enters the menu and allows you to select and change parameter values. SC. Returns to the next highest level of menus.

OME. Returns to the top of the menu structure. EVEL INDICATOR. Indicates the level of the selected channel or parameter. HANNEL ACTIVITY LEDS. Indicates gating activity of the 8 mic/line channel

PRE-INSTALLATION

10 1211 159 1413

Figure 3. Parallel remote control, EF BUS, serial remote control, ASPI BUS OUT, and power supply input on back panel of the EF2280.

9. INPUT PARALLEL PORT. Parallel logic input.

10. O

UTPUT PARALLEL PORT. Parallel logic output.

11. EF B

12. EF B

13. RS-232 S

14. ASPI B

15. P

US IN. Connects to EF BUS OUT of another EF2280. US OUT. Connects to the EF BUS IN of another EF2280.

ERIAL PORT. Connect this to an optional RS-232 remote control device,

such as a touch panel or personal computer COM port.

US. Connects to the ASPI Bus of another EF device (an EF1210 or an

EF200) to be used for RS-232 control from a single control device.

OWER SUPPLY INPUT. Connects to the external power supply provided with the

EF2280.

19181716

Figure 4. Inputs and outputs on back panel of the EF2280.

16. M

IC/LINE INPUTS. Connects to microphone at either mic or line level, with or

without phantom power.

17. L

INE INPUTS. Inputs A-D at line level.

18. L

INE OUTPUTS. Outputs 1-8 at line level.

19. L

INE OUTPUTS. Outputs A-D at line level.

VORTEX EF2280 Reference Manual 6 Technical Support: 800.932.2774

NSTALLATION

OUNTING THE

INSTALLATION

EF2280

The EF2280 can be mounted in a rack enclosure using four large screws (10-32x1/2”) included with the unit. One EF2280 fits in a single rack space.

Recommendation For Easy Access

Instructions for Securing Power Supply to Back of EF2280

ONNECTING THE

While not required, leave a single rack space in between the EF2280 and other units in your rack. This gives you easier access to the back panel. If you cannot leave a single rack space, mount the EF2280 below units that are longer in length so that you can access the Phoenix connectors on the back panel more easily.

• Locate the cable clamp on the back panel of the EF2280 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 EF2280 and tighten the screw. Align the clamp so that the power cable does not interfere with the connectors on the EF2280 back panel.

• Plug in the power supply.

• We recommend that you also Ty-wrap the power supply to the rack. 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 EF2280.

Caution! Do not use any other power supply other than the one pro-

vided with this unit.

EF2280 TO O

THER EQUIPMENT

Grounding The EF2280 has 8 mic/line inputs plus 4 line level inputs and 12 line level outputs.

Each input/output is “Pin 1 compatible” — this means that the ground pin of each input/output is tied to chassis ground. Chassis ground is connected to the input power ground.

Typical EF2280 Connections

The EF2280 will typically be connected to other equipment in a single room setup as shown below in Figure 5 and Figure 6.

INSTALLATION

Vortex EF2280

Out 1

Out 2

Out 3

Out 4

Out 5

Out 6

Out 7

Out 8

Out A

Out B

Out C

Out D

Video

CODEC

Line In Line Out

From AEC

From Rem.

EF200

To AEC

To Rem.

Phone

In 1

In 2

In 3

In 4

In 5

In 6

In 7

In 8

In A

In B

In C

In D

PSTN

Figure 5. Block diagram of typical EF2280 connections: a single room using one EF2280.

PSTN

ASPI Bus Connection for RS-232 Control

EF2280

Vortex

Figure 6. Typical EF2280 connections.

8 microphones

. . .

Polycom Video Codec 4-wire Connection

POLYCOM CODEC

TX RX

ASPI BUS

REMOTE CONTROL

RS-232

OISE SUPPRESSION

EVICE ID 3DEVICE ID 2DEVICE ID 1DEVICE ID 0

ESERVED (SET TO OFF)

PROM OVERRI DE

RESERVED (SET TO OFF)

DEVICE ID 4

AGC

LOGIC IN/OUT

ASPI BUS

OUT

TO PHONE

TO LINE

EF200 Phone Add (Optional)

FROM

EF400

AECTOAEC

INTERFACE

FROM

REMOTETOREMOTE

5, 15 VDC

Reference Input

Room Amplifier

Audio Amplifier

VORTEX EF2280 Reference Manual 8 Technical Support: 800.932.2774

INSTALLATION

The following steps are typically used to setup the EF2280:

• Connect a microphone to each of the 8 mic/line level inputs. The mic/line input accepts mini-Phoenix connectors. See “Connector Pinouts” on page 48 for pinouts of Phoenix connectors.

• Connect one line output to an amplifier or powered loudspeaker.

• Connect the reference input (Input A, B, C, or D) to T you have multiple EF200’s, connect only one reference) or to the output of the codec.

• Connect one line output to F codec.

• If RS-232 remote control is desired, connect the RS-232 R of the EF2280 to the remote control device, such as an RS-232 interface to a touch panel or a COM port on a personal computer. If you are using an EF200 Phone Add, connect the ASPI B EF200.

ROM AEC on the EF200 or to the input of your

US on the EF2280 to the ASPI BUS IN on the

O AEC on the EF200 (if

EMOTE CONTROL port

Note. If you are linking multiple EF2280s, you must use the EF bus

to link the units. If you are linking a EF2280 to other EF devices, such as the EF200 Phone Add, for RS-232 control, use the ASPI bus. See Figure 8 on page 11.

EVICE

ONNECTING

IDS

ON THE

ULTIPLE

• Connect the external power supply to the P EF2280.

EF B

When considering which Device IDs can be used for which Vortex device, decide how many devices have the ability to transmit on the W, X, Y, and Z busses, and how many have the ability to transmit on the P Bus. The EF2280, for example can only transmit on the W, X, Y, and Z busses while the EF2241 can transmit on the W, X, Y, and Z busses as well as the P bus. Up to 8 devices can transmit on the W, X, Y, and Z busses. Similarly, up to 8 devices can transmit on the P bus. Note that the EF2241 counts as one of both types.

Up to 8 EF2280s can be linked together at one time. Each unit in the chain must have a unique Device ID. Use the EF Bus to link multiple EF2280s together.

The following steps should be followed to connect the EF Bus:

1. Set a unique Device ID for each EF2280

2. Power off all units

3. Connect the RS-232 remote control device to any EF2280 in the chain.

4. Connect the provided Cat-5 cable between the EF B

EF2280

and the EF B

US IN of the second device.

OWER SUPPLY INPUT jack of the

US OUT of the first device,

Note. The EF Bus must be connected so that the EF Bus In of one

box is connected to the EF Bus Out of another. Connecting the EF Bus In to another EF Bus In (or Out to Out) will not work.

INSTALLATION

5. Connect another Cat-5 cable between the EF BUS OUT of the second device and the EF B

6. Terminate the chain of EF2280s using the instructions below.

7. Power on all units at the same time

US IN of the third device, and so on.

Terminating the EF2280

The EF2280 must be terminated with the provided EF Bus terminator. Place a terminator in the EF B

US IN of the first device in the chain and also in the EF BUS OUT of

the last device. If you lose the terminator provided with your EF2280 unit, see “Making an EF Bus Terminator” on page 50 for information and instructions on how to make one.

EF Bus Terminator

Cat-5 cable

...

Connecting the EF2280 with Other EF Devices

Cat-5 cable

EF Bus Terminator

Figure 7. Connecting and terminating multiple EF2280s.

The EF2280 does not have to be terminated if you are using a single unit not connected together with another EF2280.

If you are linking multiple EF2280s, you must use the EF bus to link the EF2280s to each other. If you are linking a EF2280 to other EF devices, such as the EF200 Phone

VORTEX EF2280 Reference Manual 10 Technical Support: 800.932.2774

INSTALLATION

Add, for RS-232 control, use the ASPI bus. The ASPI Bus does not need to be terminated. See Figure 8 below.

From AEC

From Rem.

EF200

ASPI Bus In

From AEC

From Rem.

EF200

ASPI Bus In

From AEC

From Rem.

EF200

ASPI Bus In

To AEC

To Rem.

Phone

ASPI

Bus Out

To AEC

To Rem.

Phone

ASPI

Bus Out

To AEC

To Rem.

Phone

ASPI

Bus Out

EF Bus

Terminator

In 1

In 2

In 3

In 4

In 5

In 6

In 7

In 8

In A

In B

In C

In D

ASPI Bus

In 1

In 2

In 3

In 4

In 5

In 6

In 7

In 8

In A

In B

In C

In D

ASPI Bus

Vortex EF2280

EF Bus OutEF Bus In

Vortex EF2280

EF Bus OutEF Bus In

Out 1

Out 2

Out 3

Out 4

Out 5

Out 6

Out 7

Out 8

Out A

Out B

Out C

Out D

Out 1

Out 2

Out 3

Out 4

Out 5

Out 6

Out 7

Out 8

Out A

Out B

Out C

Out D

EF Bus

Terminator

Figure 8. Linking the EF2280 to other EF devices.

ACTORY DEFAULT SETTINGS

RESET

The following is a list of the factory default settings of the EF2280. Since the microphones and other equipment in your application may have different nominal levels, you can start with a F ronment and then save it within the EF2280 as a U you’ve saved a U

ACTORY PRESET (Presets 0-15), change it to match your envi-

SER PRESET (Presets 16-47). Once

SER PRESET, set the POWER ON PRESET to that USER PRESET (or

INSTALLATION

whichever preset you want to come up after power up). The unit will need to be configured for your system.

PROGRAM PARAMETERS FACTORY DEFAULT PRESET VALUE

SYSTEM PARAMETERS

Preset 0

Device ID 0

AUTOMIX PARAMETERS

Chairman Mode Off

Decay Time 1000 ms

Hold Time 500 ms

Last Mic On Mode On (on Automixer 1)

Max NOM per Automixer 8

Off Attenuation -15 dB

INPUT CHANNELS

Acoustic Echo Cancellation On

Automatic Gain Control On

Automixer 1

Echo Canceller Reference Ref1

Filtering Off

Gate Priority 1

Gate Ratio 10 dB

Gate Threshold Adaptive

Gating Auto

Input Gains 15 dB for Inputs 1-8

0 dB for Inputs A-D

Manual Threshold 60 dB

Mute Off

Noise Cancellation On

Noise Cancellation Level 10 dB

Phantom Power On

OUTPUT CHANNELS

Mute Off

NOM Attenuation Off for Outputs 1-8

On for Outputs A-D

Output Gain 0 dB

VORTEX EF2280 Reference Manual 12 Technical Support: 800.932.2774

INSTALLATION

Presets and Multiple EF2280s

HECK SURROUNDING EQUIPMENT

Pick a Standard Signal Level

PRESET 0 is preconfigured for a system with multiple EF2280s. Microphones are bussed out to other units on the W Bus. Microphones are also input into each EF2280 on the W Bus (I

If you have multiple EF2280s in your system, save settings to a preset on each EF2280. Saving a preset will only save the preset on that particular unit. Also, remember to set the P

Now that the physical connections to the EF2280 are set up, it may be necessary to check the surrounding equipment to make sure levels are set correctly. The following suggestions may be helpful in integrating the EF2280 into your system:

A standard nominal signal level should be used throughout the audio system. Any equipment that does not operate at this standard level should be compensated for as close to the piece of equipment as possible. A 0 dB nominal level is a good standard signal level. For example, a consumer VCR will probably generate a -8 dBu level. As soon as the VCR signal arrives at an input with some gain control, the input gain should be adjusted so that you get a 0 dB level.

NPUT WM0 in the Matrix).

OWER ON PRESET to the correct Preset.

Check Levels to the Codec

Configure the matrix mixer output to the codec input. The output

gain of the matrix mixer should be set to match the nominal input level of the codec. For example, if the codec accepts -10 dBV (-8 dBu) inputs, 8 dB of attenuation should be applied at the matrix mixer output to the codec.

Configure the matrix mixer input from the codec output. The input

gain of the matrix mixer should be set to match the nominal output level of the codec. For example, if the codec outputs a -10 dBV (-8 dBu) level, 8 dB of gain should be applied on the matrix mixer input. This will bring the codec level up to 0 dBu inside the matrix.

Configure Output to Amplifier or Loudspeakers

The loudspeaker level may be adjusted in several places: at the amplifier or at the loudspeaker output of the matrix mixer in the EF2280. We suggest that you adjust the loudspeaker level at the amplifier to preserve good gain structure. You should try to have a 0 dBu nominal level at the outputs by applying input gain (See I Conference Composer) to obtain a 0 dB level at the input.

NPUTS tab on

Verify Room Gain After adjusting the loudspeaker level, verify the room gain in your system using the

OOM GAIN meter on the DIAGNOSTICS page of Conference Composer. See Figure 9

below. The meter shows the room gain, which is the relative level of the output level and the input level. While the EF2280 will operate in positive room gain conditions, the room gain should be around 0 dB or a negative value. If you have a positive room gain, make adjustments in the following areas:

1. Decrease the Input Gain of the microphone.

2. Decrease the Output Gain of the microphone.

INSTALLATION

3. OR adjust the placement of the microphone relative to the loudspeaker.

Room Gain Meter

Read Room Gain

from here

Configure Program Audio Sources

Figure 9. Room Gain Meter on the Diagnostics page of the Conference Composer control software.

Set the gains on the matrix mixer inputs from the program audio sources so that program audio is played into the room at a level similar to that of speech from the remote site. This should also ensure that the program audio levels are good when sent to the remote site.

VORTEX EF2280 Reference Manual 14 Technical Support: 800.932.2774

NTEGRATING THE

EF2280 I

INTEGRATING THE EF2280 INTO YOUR SYSTEM

NTO YOUR SYSTEM

Operating the EF2280

NPUT SETTINGS

Set Inputs 1-8 for Mic or Line Level

Select Phantom Power for Inputs 1-8

The EF2280 can be operated in two ways: through the LCD menu on the front panel or through RS-232. For control via RS-232, please refer to the EF2280 Programming Guide, which includes programming tips as well as the EF2280 RS-232 commands. For operation using the PC control software, Conference Composer, please refer to the Conference Composer User Guide.

Use Conference Composer Software to easily configure the EF2280 with a PC, or refer to the Applications Guide for different configurations that are already programmed into factory presets.

Configure Inputs 1-8 for mic or line level using the LCD menu (See “Level” on page 30) or Conference Composer Control Software (See the Conference Composer User Guide).

Turn phantom power On or Off for Inputs 1-8 using the LCD menu (See “Phantom Power” on page 31) or Conference Composer Control Software (See the Conference Composer User Guide). Phantom power should be turned On for condenser and electret microphones.

ALIBRATION

Set Mic/Line Input Channel Gains

When using the power on Preset 0, the following calibration can be used.

In Preset 0, Automatic Gain Control (AGC) is On and the microphone gains on Inputs 1-8 are set to 15 dB. The AGC will compensate for the microphone gain. If you are using ceiling microphones, set the microphone gain to 28 dB.

Fine tune the Input Gain using the Automatic Gain Control (AGC) meter on Conference Composer Software.

Software, go to the D one is talking into the particular channel that you are adjusting. Watch the number in the box at the bottom of the AGC meter (See Figure 10 below). This is the amount of gain that the AGC is applying. The goal is to have the AGC meter on average staying around 0. If the level that you see in the box is negative, decrease the input gain by the average number that you see in the box because the AGC is attenuating the channel’s input gain because the level is too high. If the number in the box is positive, increase the input gain on that channel because the AGC is boosting the signal because it is too low. For example, if the meter is showing an average gain of -15 dB,

IAGNOSTICS page. Watch the meter labelled AGC while some-

In the Conference Composer

INTEGRATING THE EF2280 INTO YOUR SYSTEM

you should increase your input gain by 15 dB. If the meter shows an average gain of +10 dB, you should decrease your input gain by 10 dB.

AGC Level Meter

Read AGC le

Adjust Input Gain here

Figure 10. AGC Meter on the Diagnostics page of the Conference Composer software.

F THE AGC METER SHOWS... ADJUST THE INPUT GAIN IN THIS WAY.

positive gain Increase gain by the level

shown in the box.

negative gain Decrease gain by the level

shown in the box.

an average level of 0 dB You’ve set the Input Gain

to a good level!

Table 1: How to set the Input Gain using the AGC meter on the Conference Composer Diagnostics page.

Set Levels on Line Input Channels

Set the line input channel gains (Channels A-D) to match the nominal level of the incoming equipment. The line inputs have a maximum nominal level of 0 dBu. If your incoming line level inputs have a higher nominal level than 0 dBu you will want to use a pad to remove the level.

VORTEX EF2280 Reference Manual 16 Technical Support: 800.932.2774

INTEGRATING THE EF2280 INTO YOUR SYSTEM

Customize Setting for Your Particular

The following sections will describe customizing parameters on the EF2280 for your particular application if you are not using Preset 0.

Application

UILD YOUR ECHO CANCELLER REFERENCE

The acoustic echo canceller (AEC) reference should generally contain exactly the same audio signals as what is coming out of your loudspeaker(s), since the signal output from the loudspeaker is what is then picked up by the room’s microphones causing acoustic echo. Note that this statement is a general statement. Conditions for this being true follow:

If your system does NOT have sound reinforcement,

• The AEC reference should contain exactly the same audio as the loudspeaker output: all far end audio, audio from the phone add, program audio, etc.

• If your system contains stereo inputs and outputs, the reference must contain a mix of both stereo inputs. For example, if your VCR audio is in stereo, the reference should contain both the left and right signals each attenuated by 3 dB, as well as any other audio that is going to your loudspeaker.

• If you are using crosspoint gains in the loudspeaker mix, apply the same gains to the signals in your reference.

If your system has sound reinforcement,

• Do NOT mix your room microphones into the reference, but include all other audio (program audio, remote audio, phone audio, etc.).

• An exception to this rule is when you use one EF2280 split to operate independently in two rooms. If the two rooms communicate with each other (along with communicating via codec and the phone line), the reference in the first room must contain the microphones from the second room and vice versa. See Figure 11 below.

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