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 Analogue A/V PRODUCTS  Analogue Audio

 

  AA-780   Balanced/Unbalanced Line Audio Interface Adapter
  AAA-3131   5 Stereo O/P Analogue Audio DA

  AAD-4130   Audio Detector with Stereo Phase & Fail Alarm

  AAP-3190   Stereo Audio Monitoring Amplifier
  DAI-3206   270 Mb/s SDI Digital & Analogue Audio Inserter
  DAX-3206   270 Mb/s SDI Digital & Analogue Audio Extractor

AA-780

Balanced / Unbalanced Line Audio Interface Amplifiers

Features
  • User configurable
  • Unbalanced to balanced
    or
  • Balanced to unbalanced
  • High common mode rejection
  • Wide gain range
  • High packaging density

General

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 include:

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.
 

AAA-3131

Audio Distribution Amplifier

Applications:
  • Stereo signal duplication and distribution.
  • Level matching and balancing.
  • Stereo/mono switching.
  • Inline tone generation.

Features:

  • Selectable stereo or mono mode.
  • 10, 20 or 26 outputs (depending on connector type).
  • Balanced or unbalanced operation.
  • Front panel monitoring bantam jacks.
  • LED audio activity indicators.
  • Front panel gain adjustments.
  • Optional remote control.
  • Optional in line stereo tone generator.
  • Selectable gain ranges: +6 dB, +12 dB & +18 dB.
  • Maximum output level +24 dBu.
  • Extended bandwidth option for ACS or timecode.

General

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: 

AAO-3130: FACTS stereo oscillator module. Left continuous & right interrupted with remote ADA/oscillator control switching. CAA-3130: Remote select Stereo/L+R / Lmono / Rmono and L-phase reversal control module.
CAA-3132: 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.

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AAD-4130

Audio Detector with Stereo Phase & Fail Alarm

Features
  • Individual left and right failure outputs.
  • 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.

General

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 10 kOhms.


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 circuit.


Visual indication of the state of the AAD-4130 detector and alarm circuits is provided by LED indicators on the front panel.

AAP-3190   

Stereo Monitoring Amplifier

Features
  • Switchable level or phase display (L+R & L-R).
  • Remote & front panel volume controls.
  • Input gain adjustable to +6, +12, or +18 dB.
  • Maximum volume preset.

Applications

  • Phase & level monitoring in distribution chain.
  • Edit suites audio monitoring.
  • Headphone monitoring for live recording.
  • O.B. van audio monitoring.
  • Headphone amp for multilingual conferences.

General

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 checked.

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DAI-3206

270 Mb/s SDI Digital & Analogue Audio Inserter

Features:
  • Standard 75 Ω 270 Mbit/s SDI input
  • 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 inputs
  • Selectable re-sampled or non re-sampled modes
  • Supports SMPTE 272M-A synchronous 48 kHz insertion
    (resampled mode)
  • 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 insertion
  • Ability to replace existing embedded audio
  • 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

General

 

The DAI-3206 is a high performance audio embedder for 270 Mbit SDI video signals. It supersedes the earlier DAI-3200 audio embedder.

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.

The DAI-3206 supports AES/EBU synchronous/ asynchronous 48 kHz, 20-bit audio data packets.
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 DAX-3206 audio extractor.

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 modules
.

 

DAX-3206

270 Mb/s SDI Digital Audio Extractor

Features
  • Standard 75 Ω 270 Mbit/s video input
  • Standard 75 Ω 270 Mbit/s video output
  • Extracts embedded audio (Supports 48 kHz Synchronous and Asynchronous level A & D audio packet decoding)
  • Supports 525 & 625 line standards
  • Indicators / external alarms for loss of carrier & audio
  • Automatic input equaliser to 250 m
  • Four high quality analogue audio outputs
  • Two 110 Ω balanced or 75 Ω unbalanced AES outputs
  • IRT Eurocard format

General

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 source.

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 control switch.

The DAX-3206 supports AES/EBU synchronous and asynchronous audio at 48kHz, 20-bit audio data packets.

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.

An audio 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 and audio.
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 modules.

 

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