Widespread adoption in theater, DVD, and digital television contexts. It has been supplanted by (and incorporated as part of) A/52:2010: Digital Audio Compression (AC-3) (E-AC-3) Standard (link available through Internet Archive). This version is no longer available from ATSC. ATSC Standard: Digital Audio Compression (AC-3), Revision A.
Specification developed by the Audio Specialist Group of the ATSC.ĪTSC Doc. See History Notes below.įully documented. Revision B and 2010 version (published as part of ATSC A/52:2010: Digital Audio Compression (AC-3) (E-AC-3) Standard), not documented at this time. VOB (MPEG-2 Multiplex for DVD) may use AC-3 Elementary Stream, not documented at this timeĪTSC digital broadcast television, not documented at this timeĪTSC document A/52 (prior to Revision A), not documented at this time Specification for the inclusion of AC-3 audio in MPEG-2 streams (and other matters). Generally used for final-state, end-user delivery.ĪES3 Digital Audio Interface, SMPTE Extensions. Revision B is not described at this Web site at this time.
Note: Revision B was published in 2010 and added a new annex, “Enhanced AC-3 Bit Stream Syntax” which specifies an additional syntax that offers additional coding tools and features. Some ac3 files are downloadable from Web sites, suggesting that they have a life separate from DVD production comments welcome. According to the Wikipedia (entry for Dolby Digital, as viewed in October 2005), Dolby Digital Plus (rates to 3 Mb/s) will be used in the emerging high definition DVD formats, and this encoding is reported to be backward compatible with AC-3 compliant players.įiles with an ac3 extension are used in the course of authoring a DVD, at which point they are multiplexed ("muxed") with the video stream. In DVD applications and in digital cable television, however, player and distribution limitations keep the maximum to 448 kb/s. The maximum bitrate in the ATSC AC-3 specification is 640 kb/s. This Web page describes AC-3 as standardized by the Advanced Television Systems Committee (ATSC) the trademarked Dolby Digital codec family includes AC-3 and other variants. Lossy format designed for the efficient encoding of surround sound, developed to support motion picture presentations in theaters and at home. A/52A) (formal name) AC-3 and Dolby Digital (common names) Digital Audio Compression (AC-3), Revision A (ATSC Doc.
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