ATSC A/52
Dolby AC-3 Digital Audio Compression
All ATSC Audio employs, for purposes of transmitting digital audio, the protocol published in ATSC A/52, the AC-3 (or Dolby AC-3) Audio Compression Standard. A/52
Annex A establishes the syntax and semantics of the AC-3
Audio Descriptor which is required to be present in any elementary stream
descriptor loop for an AC-3 elementary stream and in the "current event" in an
Event Information Table (EIT) section for a virtual channel that includes at
least one AC-3 stream.
All EtherGuide Systems broadcast metadata generators, when provided with
information on the presence of an AC-3 audio service, will dynamically construct
and generate the proper form of the AC-3 audio descriptor in the current event
in each Event Information Table (EIT-k0) and, if configured to do so, in the
corresponding Program Map Table.
ATSC A/52 editions
| Code | Date | Comment | EtherGuide Systems comment |
| A/52B | 20050614 | Current edition | Second edition
version, which adds support for E-AC-3 and makes other minor edits. This
edition also changed the name of the descriptor to AC-3 audio descriptor
(AC-3_audio_stream_descriptor syntactially). This edition is incorporated
by reference in FCC rules (47 CFR 73.8000) |
| A/52A | 20010820 | Corrections to original publication | Correction |
| A/52 | 19951220 | Original Publication | Initial version of the specification (see 20010820 entry) |
See: ATSC Standards ATST standards may be downloaded
(for free) from http://www.atsc.org/standards
Dolby, Dolby AC-3 are registered trademarks of Dolby Laboratories and are used with
permission.
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