Adaptive Transform Coder 3

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Dolby Digital

Dolby Digital, or AC-3, is the common version containing 6 total channels of sound, with 5 channels for normal-range speakers (Right front, Center, Left Front, Right Rear and Left Rear) and one channel for the LFE, or subwoofer. The Dolby Digital format supports Mono and Stereo usages as well.

This codec has several aliases, which are different names for the same codec:

  • Dolby Digital (promotion name, not accepted by the ATSC)
  • DD (an abbreviation of above, often combined with channel count: DD 5.1)
  • Dolby Surround AC-3 Digital (second promotional name, as seen on early film releases, and on home audio equipment till about 1995/6 or so)
  • Dolby Stereo Digital (first promotional name, as seen on early releases, also seen on True Lies LaserDisc)
  • Dolby SR-Digital (when the recording incorporates a Dolby Surround format recording for compatibility)
  • SR-D (an abbreviation of above)
  • Adaptive Transform Coder 3 (relates to the bitstream format of Dolby Digital)
  • AC-3 (an abbreviation of above)
  • Audio Codec 3, Advanced Codec 3, Acoustic Coder 3 (These are backronyms. However, Adaptive TRansform Acoustic Coding 3, or ATRAC3, is a separate format developed by Sony)
  • ATSC A/52 (name of the standard, current version is A/52 Rev. B)

External Link

  • Dolby on the world wide web.

This article is licensed under the GNU Free Documentation License. It uses material from the article: AC3 on the WIKIPEDIA

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