DAX-4207:   3G/HD/SD-SDI Digital Audio Extractor.


      Standard 75 Ohm 3G/HD/SD-SDI video input and outputs.
      Supports 3G and all HD & SD video line and frame rate standards.
      Extracts audio signals from 2 selectable groups.
      Eight high quality analogue audio outputs,
      Four 110 Ohm balanced AES outputs, or optionally four 75 Ohm unbalanced AES
      Indicators for presence of SDI input type & audio within selected groups.
      External alarms for loss of carrier & audio.
      Selectable tone generator on audio outputs for audio test alignment signals.
      Cascadable - Two SDI outputs for connection to additional units.
      Simple Network Management Protocol (SNMP) capable.


User Manual  


The DAX-4207 is a high performance embedded audio extractor for either 2.97 Gb/s 3G-SDI, 1.485 Gb/s HD-SDI or 270 Mb/s SD-SDI video signals. It is primarily designed to operate with IRT's DAI-4207 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-4207 is capable of extracting two audio groups from those available. Selection is made via on board DIP switches.

Both analogue and digital audio outputs are provided so that the one module may be used for all applications in monitoring and processing.

Front panel LED indicators are provided for SDI input rate and audio presence on selected groups.

A selectable tone generator with multiple frequency test tones and levels is provided allowing for audio system setup alignment. These appear on both the AES and analogue audio outputs, when selected.

The DAX-4207 is cascadable with two SDI outputs being provided.

Simple Network Management Protocol (SNMP) monitoring is possible when mounted in an IRT frame fitted with SNMP capability.

The DAX-4207 is fabricated in IRT's standard Eurocard format and may be housed in a variety of IRT Eurocard frames alongside other standard modules.

NOTE:      X corresponds to Groups 1, 2 or 3;
                Y corresponds to Groups 2, 3 or 4
                (X cannot equal Y).
M LED     Drop Frame rate indicator.
                Corresponds to various 3G and HD frame rates at 23.98, 29.97 or 59.94 frames per second.


SDI input:
1 (BNC).
75 Ω terminated.
Automatic, >100 metres at 1.485 Gb/s & 2.97 Gb/s,
> 250m at 270 Mb/s for Belden 8281 or equivalent cable.
270 Mb/s (SD-SDI) video with or without embedded audio serial data to SMPTE 259M;
1.485 Gb/s (HD-SDI) video with or without embedded audio serial data to SMPTE 292M;
2.97 Gb/s (3G-SDI) video1 with or without embedded audio serial data to SMPTE 424M.

SDI output:
2 (BNC).
75 Ω sourced.
Regenerated and re-clocked, as per input type.

AES/EBU Outputs:
4 (2 Groups).
110 Ω balanced (standard), or 75 Ω unbalanced (with optional rear assembly).
Signal amplitude
3.5V ± 1Vp-p (standard balanced rear assembly);
(1 Vp-p optional unbalanced BNC rear assembly).
Audio pair Group X2
AES 1 & AES 2 (CH1/2 & CH3/4).
Audio pair Group Y2
AES 3 & AES 4 (CH5/6 & CH7/8).

Analogue Audio Outputs1:
8 (2 Groups).
Impedance (balanced)
< 60 Ω.
Input Level
+24 dBu at Full Scale.
SNR unweighted
90 dBFS.
Frequency response
0.5 dB (20 Hz to 20 kHz).
0.05% (20 Hz to 20 kHz).
0.05% SMPTE at +4 dBu.
Crosstalk between channels
95 dB, at unity gain, 20 Hz to 20 kHz and relative to +24 dBu.
Audio pair Group X2
Audio-1L (CH1), Audio-1R (CH2), Audio-2L (CH3) & Audio-2R (CH4).
Audio pair Group Y2
Audio-3L (CH5), Audio-3R (CH6), Audio-4L (CH7) & Audio-4R (CH8).

Front Panel Indicators:
SD-SDI input present.
HD-SDI input present.
3G-SDI2 input present.
Dropped Frame indicator. 3G/HD-SDI Frame Rate = 23.98, 29.97 or 59.94 fps, varies with line rate and whether interlaced or progressive.
Channel 1 audio present in Group X position2.
Channel 2 audio present in Group X position2.
Channel 3 audio present in Group X position2.
Channel 4 audio present in Group X position2.
Channel 5 audio present in Group Y position2.
Channel 6 audio present in Group Y position2.
Channel 7 audio present in Group Y position2.
Channel 8 audio present in Group Y position2.

Power Requirements:
28 Vac CT (14-0-14) or ± 16 Vdc.
Power consumption
< 8 VA.

Temperature range
0 - 50°C ambient.
Suitable for mounting in IRT 19" rack chassis with input output and power connections on the rear panel.
Finish:             Front panel
Grey background, black lettering & red IRT logo.
                       Rear assembly
Detachable silk-screened PCB with direct mount connectors to Eurocard and external signals.
6 HP x 3 U x 220 mm IRT Eurocard.

Related modules
DAI-4207 audio inserter.

              NOTE:          1
Works at 3GA 1080p50 and 1080p60 rates.
X corresponds to Groups 1, 2 or 3; Y corresponds to Groups 2, 3 or 4. X cannot equal Y.


Due to our policy of continuing development, these specifications are subject to change without notice.