Analogue A/V PRODUCTS
Audio Interface Adapter
5 Stereo O/P Analogue Audio
AAD-4130 Audio Detector with Stereo
Phase & Fail Alarm
AAP-3190 Stereo Audio Monitoring
DAI-3206 270 Mb/s SDI Digital &
Analogue Audio Inserter
DAX-3206 270 Mb/s SDI Digital &
Analogue Audio Extractor
Balanced / Unbalanced Line
Audio Interface Amplifiers
- Unbalanced to balanced
- Balanced to unbalanced
- High common mode rejection
- Wide gain range
- High packaging density
The AA-780 Eurocard audio interface amplifier module
contains four separate amplifiers designed to
provide level matching and to interface balanced
600Ω and unbalanced high impedance audio signals.
The AA-780 is a standard IRT Eurocard module and
is compatible with our other Eurocard products.
Gain controls are accessible on the front panel.
Each of the four channels can be individually
configured as either balanced to unbalanced or
unbalanced to balanced.
Uses for the AA-780
Gain matching of multiple unbalanced signals to
balanced audio signals at a central location.
Matching balanced signals to unbalanced lines.
Using hi-fi components such as CD players in a
professional studio chain.
Matching studio signals to unbalanced recorders.
Matching transducers to instrumentation recorders.
duplication and distribution.
Selectable stereo or mono mode.
10, 20 or 26 outputs (depending
on connector type).
Balanced or unbalanced operation.
Front panel monitoring
LED audio activity indicators.
Front panel gain adjustments.
Optional remote control.
Optional in line stereo tone
Selectable gain ranges: +6 dB,
+12 dB & +18 dB.
Maximum output level +24 dBu.
Extended bandwidth option for ACS
The IRT AAA-3131 is a
high performance audio distribution amplifier. Its features allow
standardisation on one ADA type to perform many functions with
consequent overall cost savings.
The AAA-3131 can be used
for either mono or stereo signals. It may be connected in balanced or
unbalanced configurations for either inputs or outputs, making it ideal
for duplicating applications.
Front panel access is
provided for the gain adjustment of Left and Right channels from zero
output to the maximum of the selected gain range.
LED's on the front panel
indicate the presence of audio on each channel and balanced
output bantam jacks are provided for front panel monitoring.
Optional plug in
sub-boards may be fitted to suit special applications:
oscillator module. Left continuous & right interrupted with remote
ADA/oscillator control switching.
select Stereo/L+R / Lmono / Rmono and L-phase reversal control
Remote L&R gain,
balance, stereo/mono and phase control module
The AAA-3131 is
fabricated in IRT's standard Eurocard format and may be housed in a
variety of IRT Eurocard frames alongside other standard modules.
with Stereo Phase & Fail Alarm
Individual left and right failure
Stereo out of phase output.
Adjustable threshold on each output.
Adjustable fail and restore times
Relay isolated outputs.
Front panel indications.
Remote, local or auto reset.
The AAD-4130 audio detector is designed to
be used to detect the presence of a stereo program signal and provide
alarm outputs on failure of the left, right or both channels and of
stereo phase reversal. Alternately the AAD-4130 can be used to monitor
two mono audio circuits and provide individual alarm outputs on failure
of a audio circuit.
The AAD-4130 will accept audio signals in the range -20 dBm to +20 dBm
from a balanced or unbalanced source, presenting an input impedance of
The detector circuitry consists of precision rectifier circuits driving
comparators. These enable oscillators to trigger dual monostable
circuits allowing the response time of the alarm circuits to be set
The response time is set by means of DIP
switches in the RC timing circuit and is adjustable from 5 to 160
seconds for the AUDIO FAIL time out and 5 to 40 seconds for the AUDIO
PRESENT response time, the adjustment being made in 5 second steps.
The alarm circuitry consists of latching circuits triggered by the
detector circuits. These drive two relays whose contacts are available
at the rear panel of the AAD-4130.
The alarm circuits can be reset automatically upon return of the audio
signals or by a contact closure from the front panel or a remote
Visual indication of the state of the AAD-4130 detector and alarm
circuits is provided by LED indicators on the front panel.
Stereo Monitoring Amplifier
Switchable level or
phase display (L+R & L-R).
Remote & front panel
Input gain adjustable
to +6, +12, or +18 dB.
Phase & level
monitoring in distribution chain.
Edit suites audio
for live recording.
O.B. van audio
Headphone amp for
The AAP-3190 has been
designed to fulfil the role of a general purpose audio
monitoring amplifier for the broadcast industry.
Most monitoring applications only require low audio power
levels, but high quality performance in the smallest
convenient packaging. The Eurocard format is ideal for this
use as it allows these monitoring amplifiers to be
positioned in the same frame as other modules such as audio
distribution amplifiers and switchers.
The front panel of the unit features two LED bargraph
displays with VU drivers for visual indication of input
levels. These may be switched to indicate Left + Right and
Left - Right so that the phase of a stereo signal may be
Mb/s SDI Digital & Analogue Audio Inserter
The DAI-3206 is a high performance audio
embedder for 270 Mbit SDI video signals. It supersedes the earlier
DAI-3200 audio embedder.
Standard 75 Ω 270 Mbit/s SDI
Inserts audio – either 2 AES
signals containing 2 channels each, 4 analogue channels or a
combination of AES and analogue pairs
110 Ω (standard) or 75 Ω AES
Selectable re-sampled or non
Supports SMPTE 272M-A synchronous
48 kHz insertion
Supports SMPTE 272M-AD
asynchronous 48 kHz insertion (non resampled mode)
20 bit audio supported
Z, C, U data preserved
Automatic EDH correction and/or
Ability to replace existing
Supports 525 & 625 line formats
Indicators / external alarms for
loss of carrier & audio
Automatic SDI input cable
equaliser to 250 m
Two 270 Mb/s SDI outputs for
connection to additional units
Existing embedded data packets may be optionally removed and/or replaced
via link settings on the PCB.
Each DAI-3206 is capable of inserting one audio group (2 AES signals, 4
analogue channels or combination of AES and analogue pair channels) into
an existing SDI video stream. Group position selection is made by the
front panel local control. Note that when inserting 2 AES streams, both
channels must be frequency locked to each other. Analogue audio is
automatically locked to the other AES signal, if present, or else to the
SDI video input.
supports AES/EBU synchronous/ asynchronous 48 kHz, 20-bit audio data
An audio presence indicator is provided for each input. If one AES or
analogue audio pair is missing then those particular channels are set to
zero. If both AES and/or analogue audio pairs are missing (dependent on
mode selected), then no packets are inserted.
The DAI-3206 complements the
The DAI-3206 is fabricated in IRT's standard Eurocard format and may be
housed in a variety of IRT Eurocard frames alongside other standard
270 Mb/s SDI
Digital Audio Extractor
75 Ω 270 Mbit/s video input
75 Ω 270 Mbit/s video output
embedded audio (Supports 48 kHz
Synchronous and Asynchronous level A & D
audio packet decoding)
525 & 625 line standards
Indicators / external alarms for loss of
carrier & audio
input equaliser to 250 m
quality analogue audio outputs
Two 110 Ω
balanced or 75 Ω unbalanced AES outputs
The DAX-3206 is
a high performance embedded audio extractor for
270 Mbit SDI video signals. It is primarily
designed to operate with IRT's DAI-3206 digital
audio inserter but will work on any embedded SDI
A typical SDI signal may contain up to eight
audio pairs arranged in four groups. Each
DAX-3206 is capable of extracting one audio
group (2 AES / 4 analogue) from those available.
Selection is made via a front panel local
The DAX-3206 supports AES/EBU synchronous and
asynchronous audio at 48kHz, 20-bit audio data
Both analogue and digital audio outputs are
provided so that the one module may be used for
all applications in monitoring and processing.
The use of digital audio filtering and 20-bit
digital to analogue converters produce studio
quality analogue audio and the AES/EBU digital
interface allows digital interconnection in
either balanced or unbalanced formats.
presence indicator is provided for each group
output. If no audio is detected the
corresponding output is muted.
The DAX-3206 complements the
DVC-4112 SDI to analogue video converter for
full conversion of SDI signals to analogue video
The DAX-3206 comes configured standard with 110
Ω balanced AES/EBU outputs. 75 Ω unbalanced
outputs are available by insertion of links on
the rear assembly.
The DAX-3206 is fabricated in IRT's standard
Eurocard format and may be housed in a variety
of IRT Eurocard frames alongside other standard