DAI-3206 Instruction Book
Revision 6
www.irtelectronics.com
Page 4 of 12
3206-DAI_ib_Rev6.doc
IRT Eurocard
Type DAI-3206
Digital Audio Inserter for 270Mb/s SDI
General Description
The DAI-3206 is intended as a high performance audio embedder for 270 Mbit SDI video signals.
A typical SDI signal may contain up to eight audio pairs arranged in four groups although only one group is
normally required for program distribution.
2 AES signals, 4 analogue audio signals, or a combination of 1 AES and 2 analogue audio signals may be inserted
into an existing SDI video stream.
Each DAI-3206 is capable of inserting one audio group (2 AES signals – 4 channels). Group position selection is
made by the front panel local control.
Regenerated SDI outputs are provided to allow connection of more modules if additional channels are required.
The DAI-3206 supports AES/EBU synchronous / asynchronous audio at 48 kHz, 20-bit audio data packets.
An audio presence indicator is provided for each input. Depending on the mode selected, if one AES audio pair is
missing then those particular channels are set to zero. If both AES pairs are missing then no packets are inserted.
The DAI-3206 complements the DAX-3206 audio extractor.
Front panel LED’s indicate a loss of SDI input and the presence of AES1 and AES2 signals. An external relay alarm is
also provided on the rear assembly.
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.
Standard features:
•
Standard 75
Ω
Ω
Ω
Ω
270 Mbit/s video input.
•
Inserts audio - either 2 AES signals containing 2 channels each, 4 analogue channels or a combination of
AES and analogue pairs.
•
Selectable re-sampled or non re-sampled modes.
•
Supports SMPTE 272M-A Synchronous 48 kHz Insertion (re-sampled mode).
•
Supports SMPTE 272M-AD Asynchronous 48 kHz Insertion (non re-sampled mode).
•
20 bit audio supported.
•
Z, C, U data preserved (non re-sampled mode).
•
Select between AES & Analogue audio inputs.
•
Automatic EDH correction and / or insertion.
•
Ability to replace existing embedded audio.
•
Automatic selection between 525 & 625 line formats.
•
Indicators / external alarms for loss of carrier & audio.
•
Automatic input equaliser to >250 m.
•
Two 270 Mbit/s SDI outputs for loop through to additional units.
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Communications
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