Dolby Digital (AC-3)
Dolby Digital (AC-3), Dolby's best-known digital system, is used to provide multichannel surround sound in cinemas from 35 mm film, and in the home from laser discs, DVDs, and digital broadcast television, cable, and satellite systems. It enables the transmission and storage of up to five full-range audio channels, plus a low-frequency enhancement channel (LFE), in less space than is required for just one linear PCM-coded channel on a compact disc. Additional features include the transmission of metadata that can control playback parameters such as dialogue-keyed playback level, and the ability of two-channel decoders to downmix multichannel soundtracks.
Digital Audio Compression (AC-3) Standard: ATSC Document A/52 (PDF: 91KB)
ATSC A/52 document provided by Advanced Television Systems Committee
All other documents provided by Dolby Laboratories
MPEG Audio Standard
These official documents contain all information conerning MPEG audio in relataion to A/V streams and what is expected of developers regarding these standards.
Coding of moving pictures and associated audio.... Part 3: Audio Contents
(ZIP: 157KB)
Generic Coding of Moving Pictures and Associated Audio - Audio
(ZIP: 146KB)
Document copyright ISO/IEC Copyright Office
Super Audio-CD Standard
A new standard which has been developed by Phillips and Sony. These two giants have created what they hope to be the next generation of Audio CDs. Be sure to check out the documentation to get up to date on this format of the future.
Super Audio Compact Disc: A Technical Explaination
(PDF: 249KB)
Document copyright Phillips System Standards & Licensing
Super Video-CD Standard
The standard that came to the rescue for those who were not content with the quality of VCD. Although not very popular in North America until a few years later, this is an irreplaceable standard and will probably be around for quite a while still.
Super Video Compact Disc: A Technical Explaination
(PDF: 91KB)
Document copyright Phillips System Standards & Licensing
Advanced Streaming Format (ASF) Specification
02/26/98 Public Specification Version 1.0
(RTF: 725KB)
Document copyright Microsoft Corporation. Co-Authored by RealNetworks, Inc.
Miscellaneous Documents
Get an inside scoop at what the latest technologies in the works will bring. Read about MPEG-4 and next generation formats like JPEG2000 and MPEG-7, which are already being developed.
Information technology: Multimedia standards - What's next?
(PDF: 155KB)
Document copyright ISO Standards Committee.
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