Hall Research AD-340 User Manual

User’s Manual

Model AD-340

Universal Audio Delay Processor

CUSTOMER
SUPPORT
INFORMATION

Order toll-free in the U.S. 800-959-6439
FREE technical support, Call 714-641-6607 or fax [phone]
Address: Hall Research, 1163 Warner Ave. Tustin, CA 92780
Web site: www.hallresearch.com E-mail: [e-mail]

UMA1186 REV A

Universal Audio Delay Processor

Contents

1 Introduction.....................................................................................2

1.1 General........................................................................................................ 2

1.2 Features.......................................................................................................3

2 Installation.......................................................................................4

2.1 Package Contents ....................................................................................... 4

2.2 Front and Rear Panel..................................................................................4

2.3 Input and Output Connections..................................................................... 5

3 Configuration & Operation.............................................................6

3.1 Front-Panel Button Operation...................................................................... 6

3.2 Windows-Based Software GUI....................................................................7

3.2.1 Installation................................................................................................. 7

3.2.2 Operation.................................................................................................. 8

3.3 Audio Configuration...................................................................................12

3.3.1 General................................................................................................... 12

3.3.2 Sampling Rates ...................................................................................... 13

3.3.3 Audio Mute Function...............................................................................13

3.3.4 Analog Input/Output Volume Control...................................................... 14

3.3.5 Delay Function........................................................................................14

3.3.6 Factory Default Settings ......................................................................... 17

4 Troubleshooting............................................................................17

4.1 FAQ...........................................................................................................17

4.2 Contacting Hall Research.......................................................................... 18

4.3 Shipping and Packaging............................................................................ 18

5 Specifications................................................................................19

6 Trademarks....................................................................................19

FCC Statement

This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly,
that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.
It has been designed to comply with the limits for a Class A computing device in accordance with the
specifications in Subpart B of Part 15 of FCC rules, which are intended to provide reasonable protection against
such interference when the equipment is operated in a commercial environment. Operation of this equipment in
a residential area is likely to cause interference, in which case the user at their own expense will be required to
take whatever measures may be necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.

1

Model AD-340

1 Introduction

1.1 General

Thank you for purchasing the professional and compact AD-340 Audio Delay
Processor from Hall Research. This User’s Manual applies to both the AD-340
Audio Delay Hardware and the Windows-based Audio Delay Software Graphical
User Interface (GUI).

The AD-340 can be configured directly from the Front Panel Push Buttons or
from the GUI when the AD-340 is connected to a Windows HOST PC with a USB
cable. The Software GUI for the AD-340 is designed to be an intuitive and
powerful user interface, and the front panel is simple and easy to use.

The AD-340 Audio Delay Processor provides both Analog (Left and Right Stereo
Channels) and Digital Audio Inputs and Outputs, including CD, DVD or Blu-Ray
Disc quality audio processing.

The user controllable Delay Functions allow an adjustable digital delay for
audio/video synchronization/timing alignment and for acoustic external delay
alignments for speaker systems located at different distances relative to the
listeners.

The AD-340 is equipped to adjust for virtually any environment. Even the Verizon
Amphitheater one of the largest venues in Southern California, is well within the
capabilities of this unit, which can adjust for distances of up to 510 feet (155
meters)

2

Universal Audio Delay Processor

1.2 Features

• Stereo Analog Input and Outputs (left and right channel) – RCA connectors

• Analog Audio Compatible with 2 Vrms Line level for CD, DVD and BD Players

• Digital Audio Input and Outputs - SPDIF over coaxial - for RCA connector

• Digital Audio (IEC60958) supporting standard CD, DVD and BD sample rates

at 32 kHz, 44.1 kHz, 48 kHz and 96 kHz

• Supports 2-channel linear PCM digital audio and 5.1 Channel Dolby Digital
and DTS encoded bitstreams.

• Converts linear PCM digital input to analog output – and analog inputs to
LPCM digital output

• User selectable digital delay functions for audio delay in millisecond, video
frames and external delay set in feet or meter

• Delay time selectable from 0 to 510 milliseconds in 1 msec increments– or 0 to
16 video frames (both 50 Hz and 60 Hz TV-systems)

• Delay time for analog or digital at 48 Hz sampling rate – up to 340 millisecond

• External delay up to 510 feet or 155 meter

• Auto-detection of digital frame rates and bitstream formats like Dolby Digital

and DTS - Indicators for SPDIF input signal quality.

• Ground Loop Isolated Analog inputs and Transformer coupled SPDIF output

• Adjustable audio input volumes for MIC inputs (with RCA adapters)

• Adjustable analog audio output volumes

• User controllable muting: Auto-mute when changes are being made

• Advanced mode: automatic calculations of speed of sound based on user

selectable temperatures (Fahrenheit or Celsius)

• Powerful and intuitive front panel controls for configuration

• Auto-save of current configuration settings

• Windows based GUI for configuration control -

• Interface to HOST PC – via Mini-B USB connector - USB 2.0

• GUI: Save and Recall of configuration settings, Factory Default Reset

• Made in USA

3

Model AD-340

2 Installation

2.1 Package Contents

Your package should contain the AD-304 Audio Delay Processor, a Universal
power supply (6v DC @ 1.5A) with interchangeable connector blades for most
countries, a USB Cable with Mini-B Connector and this User’s Manual.

The unit can run from 6 to 9v DC power (center positive), current
requirement is 200 ma max. Use of any other voltage may cause
damage to the unit and void the warranty.

2.2 Front and Rear Panel

The AD-340 is in a 4-inch wide enclosure with mounting bracket on the rear
panel. All Analog and Digital Audio Inputs/Outputs and the power connections
are on the rear of the unit. The LEDs, 7-segment LED and Push Buttons and the
Mini-USB connector are on the front panel.

Notice

FRONT PANEL:

1. Power Switch: Standby Power switch

2. Red LED Indicator: Indicates Digital Audio Input

3. Green LED Indicator: Indicates Analog Audio Input

4. SELECT Switch: Selects the Audio Input Type

5. 7-segment LED: Displays Delay Values and Delay Type

6. Red LED Indicator: Indicates Distance as delay type (Feet

or Meters)

7. Green LED Indicator: Indicates Millisecond as delay Type

8. UP Switch: Increase Values

9. DOWN Switch: Decrease Values

10. Mini-B USB Connector: Connects to HOST PC

4

Universal Audio Delay Processor

REAR PANEL

:

11. Power Connector: Connects to 6V Power Supply

12. SPDIF RCA Input: Digital Audio Input

13. Left RCA Input: Left Analog Audio Input

14. Right RCA Input: Right Analog Audio Input

15. SPDIF RCA Output: Digital Audio Output

16. Left RCA Output: Left Analog Audio Output

17. Right RCA Output: Right Analog Audio Output

2.3 Input and Output Connections

 Using RCA Coaxial cables (left/right channels usually marked

white/red), connect the analog input connectors to the audio source –
typically a CD, DVD or BD players, or a PC. A Microphone (MIC) input
with an RCA adapter can also be connected. Using an RCA Coaxial
cable (Digital usually marked orange); connect the Digital Audio to the
audio source.

 Using RCA Coaxial Cables connect the outputs to an Audio/Video

receiver or similar audio equipment. Audio Equipment with DTS
Decoder and Dolby Digital Decoder is required to decode Digital
Bitstreams encoded in the DTS Surround (5.1) and Dolby Digital
Stereo or Surround (5.1) formats.

 Plug the power supply to the unit. Use only the supply that came

with the unit.

 Install the Windows-Based Software GUI on the Host PC.
 Connect the Windows Host PC to the AD-340 with the provided USB

Cable with the Mini-B USB Connector.

Note: Sound is output simultaneously on both the Analog and Digital outputs

ONLY when the Digital Input is LPCM.

5

Model AD-340

3 Configuration & Operation

3.1 Front-Panel Button Operation

Button Function Description

(1) POWER Standby

(4) SELECT Select ANALOG or

(4+8) SELECT + UP
or
(4+9) SELECT + DN

(8) UP Increase Increase value by 1
(8) UP held down Increase Increase value by 10
(9) DOWN Decrease Decrease value by 1
(9) DOWN held
down
(8+9) UP+DOWN Set to Zero Set Delay Values to ZERO
(5) 7-segment LED Display values (6) Red LED = Time (ms)

• When the Host PC GUI is active, configurations can be made from
either the Front Panel or the Software GUI. All configuration changes
are completely synchronized in real-time.

• The Unit will automatically memorize the current delay settings, audio
type, ADC/DAC gain settings and the mute status.

Power On/Off

DIGITAL Input
Select DELAY

TYPE
(toggle function)

Decrease Decrease value by 10

Standby mode = USB inactive,
Audio non-functional (to
completely turn the unit off,
disconnect the power supply)
(2) Red LED = DIGITAL
(3) Green LED = ANALOG

Display shows:

SEC

= Millisecond

FEE

= Feet

d1S

= Meter (Distance)

F50

= Video Frames 50 Hz

F60

=Video Frames 60 Hz

(7) Green LED = Distance (ft/m)
No LED = Frames

6

3.2 Windows-Based Software GUI

Universal Audio Delay Processor

The AD-340 Programmer is a software-based solution capable of configuring any
setting on one or more AD-340 devices connected to the Windows PC via a valid
USB connection.

3.2.1 Installation

A compatible PC with Windows XP™ or later operating system with a USB
connection is required:

If the software previously installed, UNINSTALL the program first from either the
Add/Remove Programs section of the control panel or by running the previous
installation setup and selecting “remove application”.

Install the software by executing the SETUP.EXE program from the installation
source directory.

The typical user should be able to accept all the default settings but the
installation directory can be changed if desired.

Once the AD-340 Programmer Software installation has completed, either click
the desktop icon or navigate the Start Menu.

Start -> Programs -> Hall Research -> AD-340 Audio Delay

• Microsoft™ .NET Framework 2.0 or later

• If .NET Framework 2.0 or later is not installed on your PC,

the Microsoft™ website has freely available downloads.

7

Model AD-340

3.2.2 Operation

For most installations, the AD-340 can be configured fully from the Front Panel
Push Buttons.

If needed, the GUI software has full access to all the capabilities of the Audio
Delay system that are not available from the device front panel controls.

The table below summarizes the control differences between the device controls
and the software.

Feature Front Panel Software

Power  
Input Type  
Delay Type  
Delay Value Adjustment  
Sampling Rate 
Temperature Compensation 
Audio Gain 
Error Indication 
Bitstream Indication 
Digital Mute 
Analog Mute 
Front Panel Lock 
Auto Mute 

The AD-340 Audio Delay automatically configures as a HID (Human Interface
Device) and does not require any USB drivers installed by the end-user.

When the AD-340 is attached to a valid USB port, the Windows™ system will
automatically detect and identify the appropriate USB driver. There may be a
short delay while this process occurs.

This detection and driver installation only occurs when the AD-340 is connected
for the first time. Afterwards, any time a previously connected AD-340 is again
connected to the PC; it will be silently configured by the system.

Notes:

• The software scans the AD-340 settings at a rate of 10 times per
second to provide quick response times to the user.

• The GUI software on-screen fields are disabled until a valid AD-340
device is attached to the system.

• Only one instance of the program can run at a time.
Attempting to execute the application more than once
will result in an error message.

8

Tool Bar Menu:

Restore

Restore device settings from a file.
User is allowed to select any previously saved file from any location on
user’s computer. Invalid files are ignored.

Save

Save device settings to a file.
User is allowed to select any location to save the file to any location on
the user’s computer.

Tools

Factory Defaults:

Restores the unit to the factory default settings (except for
the DEVICE NAME).
The user must confirm the action.

Upgrade Firmware:
User is allowed to upgrade the internal firmware in the
device.
User selects the file and after verification; is allowed to
proceed with the upgrade process. Invalid files are
rejected. User must click ‘Upgrade Firmware’ button. User
should retry upgrading the firmware if programming errors
occur.

Exit

Exits the application.

About

Displays screen with software versions, website link, legal
disclaimer and copyright information.
The Serial # information displayed is a time/date stamp
referenced to GMT (Greenwich Mean Time) and has no
reference to the serial number label on the actual device.

Power Selection

On: Device is powered on and enabled
Standby: Device is powered off and disabled

Device Name

Used to give the AD-340 device a descriptive name up to
eight (8) characters long.
The DEFAULT name is USBDEVHR.

Universal Audio Delay Processor

9

Model AD-340

Input Selection

Analog:
Select for Analog Audio Inputs.
(E.g. from a PC Audio Output)

Digital:
Select for Digital Audio Inputs.
(E.g. from a SPDIF Audio Output)

Sampling Rate

Analog:
Adjustable to 32 kHz or 48 kHz.

Digital:
Actual Bitstream type and sampling rate displayed.
User changes not allowed.
The BitStream input type displayed underneath the indicators
for DOLBY and DTS. Possible types are:

 Linear PCM
 DTS
 Dolby Digital
 MPEG

Delay Type

 DTS-CD

Each delay type has an associated full scale
based on the Audio Sampling Rate. If the
sampling rate changes, the delay values are
automatically adjusted to fit the maximum
allowed.

Only one delay type can be active. All others not selected are disabled.
Milliseconds: Adjusts delay in units of time (ms).
Feet: Adjusts delay in units of distance (ft).

Meters: Adjusts delay in units of distance (m).
Frames – 50 Hz: Adjusts delay in units of 50 Hz frame units (20 ms

per frame).
Frames – 60 Hz: Adjusts delay in units of 60 Hz frame units (16.67

ms per frame).
Temp Compensation:

Enables the temperature control adjustments. Adjusting the temperature
values affects the delay value and full scale limits. These fields are
enabled only when the delay type is distance (E.g. Feet or Meters).

10

Miscellaneous

DOut Mute:
If selected, the digital audio output is muted.

AOut Mute:
If selected, the analog audio output is muted.
When the Audio Input type is set for Digital,
the analog output is automatically muted when the incoming BitStream is
DTS or Dolby Digital. If the Digital BitStream is Linear PCM, then the
analog output is enabled and can be muted if desired.

Auto Mute:
If selected, the audio output will mute briefly when any audio settings are
adjusted. This is to prevent the user from hearing undesirable changes in
the audio.

Front panel Lock:
If selected, the AD-340 device will not respond to the front panel buttons.

NOTE -

mode since if you were able to go into stand-by, and without the USB
connection, no one would be able to bring the unit out of Stand-By!

SPDIF Non-PCM:

SPDIF Unlocked:

SPDIF Error:

Audio Overflow:

Audio Gain

Unity:
If selected, the analog and digital audio gains are fixed to 0
dB. If not selected, the analog and digital gains can be
adjusted.

ADC: Audio gain can be adjusted +/- 24 dB
DAC: Digital gain can be adjusted +/- 6 dB

Status Bar

The bottom bar of the screen shows the current USB status as follows:

When the front panel is locked, the unit disables the Stand-by

Indicates the active BitStream signal is NOT PCM type.

Indicates that no active BitStream signal is connected to the system.

Indicates an error in the digital BitStream signal.

Indicates the incoming analog audio level is over range.

Scanning for Hardware…:
The system is looking for AD-340 devices. Screen
controls are disabled until a valid AD-340 device is found attached.

Connected – XX:
Where XX is the number of AD-340 devices connected to the
PC.

Universal Audio Delay Processor

11

Model AD-340

3.3 Audio Configuration

3.3.1 General

Select AUDIO INPUT TYPE either with the SELECT button on the Front Panel or
on the GUI. In ANALOG MODE, there are two user selectable sampling rates.
The recommended value is 48 kHz for good audio quality, but 32 kHz is available
for increased delay time.

 The SPDIF Digital Input supports the common sampling rates used by

CD, DVD, DAT and Blu-Ray Disc (BD) Players: 32 kHz, 44.1 kHz, 48
kHz and 96 kHz.

 The Digital Input supports uncompressed audio 2 channel Linear PCM

(LPCM), which is automatically converted to analog output.

 The Digital Input supports stereo or mult-ichannel compressed audio

(encoded bitstreams formats) like Dolby Digital Stereo, Dolby Digital
Surround (5.1) and DTS-CD Surround (5.1) and DTS Surround (5.1).

 The AD-340 auto-detect sampling rates and the encoded Bitstream

formats for digital inputs. The SPDIF indicators also show SPDIF
input errors and whether the PLL is locked or unlocked.

Input Mode

ANALOG Analog (L/R) Input – 32 kHz X X
ANALOG Analog (L/R) Input – 48 kHz X X
DIGITAL LPCM Digital Input – 32 kHz X X
DIGITAL LPCM Digital Input – 44.1 kHz X X
DIGITAL LPCM Digital Input – 48 kHz X X
DIGITAL LPCM Digital Input – 96 kHz X X
DIGITAL Encoded Bitstream:

Dolby Digital Stereo 2
Dolby Digital Surround 5.1
Dolby Pro Logic

DIGITAL Encoded Bitstream

DTS Surround 5.1
DTS CD Surround 5.1

DIGITAL Encoded Bitstream

(MPEG, others)

Both analog and digital audio are output simultaneously for analog input and
LPCM Digital Inputs.

The Encoded Bitstreams Formats must be decoded by an A/V receiver or similar
audio equipment with embedded Dolby Digital or DTS decoder for full 5.1
channel functions. (Note: Analog Audio is auto-muted when the AD-340 detects
a non-PCM bitstream).

 Press the SELECT button for Audio Input Type Selection. LEDs

indicate if ANALOG or DIGITAL audio input is active.

Input Format Analog

Stereo

Output

X

X

X

Stereo

PCM

Digital Output Audio

Bitstream

(5.1 Ch)

12

 The AD-340 Auto Detects the Sampling Rates for Digital Input

o 32 kHz (DSR, PC-Audio)
o 44.1 kHz (CD, DTS-CD, PC-Audio)
o 48 kHz (DVD, BD, DAT, PC-Audio)
o 96 kHz (DVD, BD, PC-Audio)
o Audio Formats: 16, 20 or 24 bits

 The AD-340 Auto Detects the Digital Bitstream format:

o Linear PCM Data (both analog and digital output available)
o Dolby Digital Stereo and Surround (only digital output)
o DTS Surround (only digital output)
o DTS-CD Surround (only digital output)

 The AD-340 indicates SPDIF Errors and if SPDIF is Unlocked on the

GUI

o SPDIF PLL lock Range: 32 kHz to 196 kHz

Universal Audio Delay Processor

3.3.2 Sampling Rates

For Analog Input, the user can choose between 48 kHz (for quality audio) or 32
kHz (for increased delay time) sampling rates. For all Digital Inputs the sampling
rate is auto-detected and cannot be changed by the user since the sampling
rates are set when the source material is encoded.

Input Type 32 kHz 44.1 kHz 48 kHz 96 kHz

Analog X X
Digital X X X X

 For Analog Input, select Sampling Rate: 32 kHz or 48 kHz

3.3.3 Audio Mute Function

User selectable Analog and Digital Audio Mute Functions.

GUI Mute Function

AOUT Mute Analog Output Mute – soft mutes the analog output from the Digital to
DOUT Mute Digital Out Mute - Mutes the SPDIF Output

Auto-Mute Auto-Mute automatically mutes the Digital and Analog output briefly

NOTE: When an Encoded Bitstream format is detected, the AD-340 automatically
mutes the Analog Output and the AOUT is checked on the GUI. It is not possible
to change the AOUT Mute in this mode. The AOUT will automatically un-mute
again when the input changes to Analog or Digital PCM.

Analog Converter

when the user makes any adjustments of audio settings
(It is recommended to leave the auto-mute on)

13

Model AD-340

3.3.4 Analog Input/Output Volume Control

The analog input and output is set to Line Levels for CD, DVD and BD Players at

(5.6 V-

2

Vrms

should be set to Unity Audio Gain (Default). However if the source is a weaker
signal – like a MICROPHONE input connected with RCA adapter – an adjustable
Gain Control allows the user to manually control both the gain of the analog
input (ADC Gain) and the analog (DAC Gain) output. The audio gain is controlled
from the GUI and is memorized.

WARNING: Make sure that the gain is not set too high when you manually adjust
the ADC or DAC gain, as this will distort either the input signal and/or the output
signal. Select UNITY on the GUI to get back to the fixed Line Level Setting at 2
Vrms Input/Output.

), so if any of these sources are used the volume control

peak-to-peak

Analog Gain Range Function

ADC Gain -24 dB to +24

dB

DAC Gain -6 dB to +6 dB Adjustable Gain for the Analog Output

 ANALOG INPUT  ANALOG OUTPUT: Both the input ADC and

output DAC gains are user controllable.

 DIGITAL INPUT  ANALOG OUTPUT: When Digital Input (for PCM

only) is converted to Analog Output; the user can control the output
DAC gain.

 DIGITAL INPUT  DIGITAL OUTPUT: There is no Gain Control for the

DIGITAL INPUT to OUTPUT (for any digital formats)

 ANALOG OVERFLOW: If the Analog Input signals are over 2 Vrms,

the Analog Overflow Indicator will start to blink.

Adjustable Gain for the Analog Input
(Analog to Digital Converter)

(Digital to Analog Converter)

3.3.5 Delay Function

Internal Delay: Different video processing equipment in the signal processing
chain can sometimes add a delay of several video frames (2-8 frames) relative to
the audio. Since video processing takes a much longer time than audio
processing, video tends to lag behind audio when audio/video becomes
asynchronous due to internal delay. Audio arriving early is generally considered
more annoying than audio arriving late relative to the video. Generally speaking,
the sound should not lead the video by more than 15 ms for an enjoyable user
experience. Likewise, sound should not lag behind the video by more than 45
ms. The threshold of detectability of asynchronous audio/video is around 45 ms,
while the threshold of acceptability is around 90 ms.

14

External (Acoustic) Delay: The need to adjust for external delay becomes an
issue when the listener gets the same sound from different sources (speaker
sets) that are placed at different distances to the listener. The bigger the relative
distance between the speaker sets the more annoying. External delay is caused
by the speed of sound; because the sound from speaker systems located at
different distances arrive at different times. Speed of sound is a function of air
temperature. At the standard air temperature of 72 °F (23°C) the speed of sound
is 1130 feet/second (345 meters/second), or 1.13 feet/msec (0.345
meters/msec). The speed of sound increases with a rise in temperature and
decreases with a fall in temperature.

The AD-340 Audio Delay Processor is designed to provide a flexible way to
adjust for these types of delay by adding a digital delay function based on 5
different delay types.

Universal Audio Delay Processor

Delay Type Delay Function

Millisecond The audio will be delayed by the number of milliseconds
Frames – 50 Hz The audio will be delayed by the number of Video Frames
Frames – 60Hz The audio will be delayed by the number of Video Frames
Feet

Meter

(50 FPS = 20 ms per video frame, 60 FPS = 16.67 ms per video frame)

Find the distance between the direct sound source (main
speaker set near the stage) and the delayed sound
source (speaker set closest to the listener) in feet.

The audio will be delayed by the calculated number of
milliseconds corresponding to the distance in feet and the
speed of sound (at the given temperature).

Find the distance between the direct sound source (main
speaker set near the stage) and the delayed sound
source (speaker set closest to the listener) in meters.

The audio will be delayed by the calculated number of
milliseconds corresponding to the distance in feet and the
speed of sound (at the given temperature).

15

Model AD-340

In calculation of delay needed for given distance the unit includes correction
needed for Haas effect. This correction masks localization of delayed audio
source, so the listener still perceives the sound coming from far source.

The maximum number of milliseconds of delay possible is a function of the audio
sampling rate as shown in the table below:

Sampling Rate 32 kHz 44.1 kHz 48 kHz 96 kHz

Max Delay in MSEC 510 ms 370 ms 340 ms 170 ms

The maximum distance also depends on the audio sampling rate and the air
temperature (which affects the speed of sound slightly) as shown below.

Temp 32 kHz 44.1 kHz 48 kHz 96 kHz

Max Delay in
FEET @ 72 °F
Max Delay in
METERS @ 23 °C

The delay values are automatically calculated and synchronized between the
different delay type options by the system, so by changing the values for one
delay type the other values are automatically changed as well. This automatic
calculation also applies to temperature changes. For external delay based on
FEET or METERS the delay in milliseconds is calculated based on the speed of
sound at the given temperature (which can be set by the user), and 20 ms is
added due to the psychoacoustic “HAAS Effect.”

Temperature Compensation: The speed of sound depends on the air
temperature. (Sound slows down with colder temperatures and speeds up with
hotter temperatures.) The table below shows some calculations. The nominal
values for speed of sound are 1130 ft/s at 72°F or 345 m/s at 23° C.

550 ft 394 feet 360 ft 169 ft

168 m

120 m 110 m 52 m

Fahrenheit Speed of Sound ft/ms

32°F 1.08
50°F 1.10
72°F 1.13
90°F 1.14

Celsius Speed of Sound m/ms

10°C 0.337
23°C 0.345
30°C 0.349

45°C 0.357
The more advanced “Temperature Compensation” function on the GUI allows the
user to enter the actual air temperature if desired. The system will automatically
update the max distance allowed in both FEET and METER Delay Types and the
corresponding delay in milliseconds based on either the FEET or METER
settings. (Note: temperature does not affect the video frame delay functions used
for internal delay.) The allowable temperature range is 32-122°F (0-50°C),
although in most cases using the default setting at 72°F (23 °C) will suffice.

16

Universal Audio Delay Processor

3.3.6 Factory Default Settings

 Analog Input – Sampling Rate: 48 kHz
 Delay Type: Millisecond – 0 msec
 Temperature: Nominal at 72° Fahrenheit and 23 °Celsius
 DOUT and AOUT mute off
 AUTO-MUTE on
 Audio Gain –Unity: ADC = 0 dB and DAC = 0 dB
 Front Panel = unlocked

4 Troubleshooting

4.1 FAQ

The analog sound is distorted.

The AD-340 is designed with Nominal Line Level for CD, DVD and BD Player, set at 2
V

). Set the Audio Gain to Unity for audio sources at Line Level. However, for added

peak-to-peak

flexibility, the AD-340 also provides user controllable audio gain for weaker sources like a
microphone. For analog audio sources with lower line output, the ADC and DAC levels can be
adjusted manually. However, make sure that the ADC and/or DAC levels are not set too high, as
this might distort the output signal.

There is no sound when Analog Input is selected.

Check that the DOUT and AOUT are set to un-mute positions (not selected) and/or adjust the
ADC/DAC gain control until you can hear sound.

There is no sound when Digital Input (PCM data) is selected.

Check that the DOUT and AOUT in the GUI are set to un-mute positions (not selected).

There is no sound when Digital Input (Bitstream) is selected.

Check that the DOUT is set to un-mute position (not selected) in the GUI. Note that the analog
output is automatically muted for digital bitstreams. You will need an A/V Receiver with Dolby
Digital Decoder or DTS Decoder to decode the encoded bitstream into multi-channel audio.

I cannot adjust the volume when I use Digital Input to Digital Output.

The volume is only adjustable for analog inputs (ADC gain) and/or analog outputs (DAC gain).
There is no gain control for digital in to digital out. The gain can be adjusted for digital input to
analog output (DAC gain).

I cannot “un-check” the AOUT Mute when playing a Digital Bitstream.

The analog output is automatically muted for encoded bitstreams and it is not possible to un-mute
AOUT while an encoded bitstream is detected.

The SPDIF Non-PCM button is “Red” – is something wrong?

No – the SPDIF Non-PCM indicator simply shows that the current digital input is an encoded
Bitstream like Dolby Digital or DTS and not Linear PCM data.

Vrms

(or 5.6

The SPDIF Unlocked or SPDIF Error button is “Red” – is something wrong?

Yes – make sure that the Digital Cable is properly inserted. The PLL needs to lock onto the
incoming digital signal to be able to playback the audio.

17

Model AD-340

What is “AUTO-MUTE”?

It is recommended to leave the “AUTO-MUTE” turned on in the GUI. The Auto-Mute will
automatically mute the outputs when audio settings adjustments are made. If unchecked, you
could hear undesirable transitional sounds when the audio settings are being changed.

The Front Panel is locked completely – How can I get it back to an unlocked
state?

The Front Panel must be unlocked from the GUI “Front Panel Lock” checkbox.

I can only change temperature when in FEET or METER mode.

Yes - Temperature compensation is only available for external delay calculations based on FEET
or METER and blocked when in MSEC or FRAMES mode.

Why is the Sampling Rate not selectable for Digital Inputs?

The source controls the digital audio sampling rate and cannot be changed. Standard Sampling
rates: 44.1 kHz for CD, 48 kHz or 96 kHz for DVD and BD. (Some Satellite STB use 32 kHz.)

Why does there seem to be a 2:1 difference between the settings and my
calculations when delaying by FRAMES?

The AD-340 calculates the FRAME delay based on a progressive type video. If you are using
interlaced video, the delay for ½ of the picture is a ‘FIELD’ and takes 2 ‘FIELDS’ per ‘FRAME’ and
you need to account for that in your calculations.

Why do the 4 Front Panel LEDs only blink when I power on the unit?

The AD-340 verifies that the internal firmware is valid. If an error is detected, the system will
automatically wait for firmware to be loaded. This should never happen in normal use, but the GUI
can be used to reload firmware into the system. Contact Hall Research Support for the latest
firmware file.

Why is the Upgrade Firmware option on the Tools menu grayed out or
doesn’t exist?

The ‘Upgrade Firmware’ option requires GUI V1.1 and V1.1 firmware or later.
If the option is ‘grayed’ out, the device can only be upgraded by Hall Research.

4.2 Contacting Hall Research

There are no user serviceable parts inside the device. Opening the device will
void the warranty.

If you determine that your AD-340 is malfunctioning, do not attempt to repair the
unit; instead, contact Hall Research Technical Support at 714-641-6607.

Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete
description.

4.3 Shipping and Packaging

If you need to transport or ship your unit:

• Package it carefully. We recommend that you use the original container.

• Before you ship the units back to Hall Research for repair or return, contact

us to get a Return Authorization (RMA) number.

18

Universal Audio Delay Processor

5 Specifications

Analog Audio:

Standards Stereo (Left and Right Channel)
Signal Level Line Level – 2
Sampling Rate Selectable: 32 kHz or 48 kHz
Cable/Connectors Coaxial Cable with RCA Connector
Frequency Response (20 Hz – 20 kHz) +/- 0.2 dB at 44.1 kHz or higher sampling rate
ADC Gain +/- 24 dB – step value 1 dB (ADC Dynamic Range: 100 dB)
DAC Gain

S/(N+D)

Digital Audio:

Standards IEC 60958 Type II – Sony/Philips Interconnect Format=S/PDIF
Audio Formats Linear PCM (stereo), Compressed Digital Bitstreams: Dolby Digital 5.1, DTS 5.1

Cable/Connectors Coaxial Cable with RCA Connector – 75 Ohm
Signal Level 0.5 to 0.6 V
PLL Lock Frequency 32 to 196 kHz
Sampling Rate 32 kHz, 44.1 kHz, 48 kHz, 96 kHz
Data Bitrates PCM 32 kHz – 2 MHz, 44.1 kHz – 2.8 MHz, 48 kHz – 3.1 MHz, 96 kHz – 6 MHz
Data Bitrates Encoded

Bitstreams

Delay Settings:

Maximum Delay Time Msec 32 kHz: 510 ms | 44.1 kHz: 370 ms | 48 kHz: 340 ms | 96 kHz: 85 ms
Maximum Frames 16 video frames at both 50 Hz and 60 Hz
Maximum Feet @ 72 °F 32 kHz: 550 feet | 44.1 kHz: 396 feet | 48 kHz: 362 feet | 96 kHz: 169 feet
Maximum Meters @ 23° C 32 kHz: 168 meters | 44.1 kHz: 128 m | 48 kHz: 117 m | 96 kHz: 52 m
Resolution for Delay Values 1 msec, 1 Frame, 1 Foot, 1 Meter
Fahrenheit Range 32° F to 122° F – Step Value: 1 °F
Celsius Range 0° C to 50° C – Step Value: 1°C
Calculation Accuracies Feet to Meter, Meter to Feet; +/- 1 unit

Other:

Power Requirement 6 to 9 v DC at 500 mADC

Temperature/humidity Storage: -40 to +158 °F (-40 to +70 °C) / 10% to 90%, non-condensing

Cooling Convection
Enclosure type Metal
Dimensions 1.18" H x 4.17" W x 3.85" D (30 mm H x 106 mm W x 98 mm D)

Product weight 0.75 lb (0.35 kg)
Shipping weight 1.5 lbs (0.70 kg)
Vibration ISTA 1A in carton (International Safe Transit Association)
Safety CE
EMI/EMC CE, FCC Class A
MTBF 90,000 hours
Warranty 2 years parts and labor

+/- 6 dB – step value 1 dB (DAC Dynamic Range: 106 dB)
90 dB (signal-to-noise and distortion ratio)

(16, 20 & 24 bit)

DTS: 1.5 Mbps – Dolby Digital- DVD: 448 kbps – Dolby Digital-BD: 640 kbps

Celsius To Fahrenheit, Fahrenheit to Celsius: +/- 1 unit
Feet to Millisecond, Meter to Millisecond: +/- 3 ms

6 vDC 1.5 ADC Universal Power Supply (100~240 VAC) included

Operating: +32 to +104 °F (0 to +40 °C) / 10% to 90%, non-condensing

Depth excludes connectors

Specifications are subject to change without notice

(5.6 V

Vrms

peak-to-peak

(transformer coupled output)

peak-to-peak

)

6 Trademarks

Hall Research and its logo

are trademarks of Hall Research.
Any other trademarks mentioned in this manual are acknowledged as the
property of the trademark owners.

19

CUSTOMER
SUPPORT
INFORMATION

© Copyright 2013. Hall Research, Inc.

All rights reserved.

Order toll-free in the U.S. 800-959-6439
FREE technical support, Call 714-641-6607 or fax [phone]
Mail order: Hall Research, 1163 Warner Ave. Tustin, CA 92780
Web site: www.hallresearch.com E-mail: [e-mail]