Dolby Digital

For the game AC3, see Armored Core 3.

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Dolby Digital is the trademarked marketing name for Dolby Laboratories' 'lossy' AC-3 codec. The common version contains 5.1 channels (five primary speakers and an LFE channel), but the format supports Mono and Stereo usages as well.

Related Topics:
Dolby Laboratories - Lossy - Codec - LFE - Mono - Stereo

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Dolby Digital EX is very similar in practice to Dolby's earlier Pro-Logic format, which utilized Matrix technology to add a center and single rear surround channel to stereo soundtracks. EX adds an EXtension to the standard 5.1 channel Dolby Digital codec in the form of matrixed rear channels, creating 6.1 or 7.1 channel output. However, the format is not considered a true 6.1 or 7.1 channel codec because it lacks the capability to support a discrete 6th channel like the competing DTS-ES codec.

Related Topics:
Pro-Logic - Matrix - Discrete - DTS

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Dolby Digital Surround EX: Whereas Dolby's Pro-Logic IIx format creates 6.1 and 7.1 channel output from stereo 2 channel (2.0). Dolby formats, the Digital Surround EX codec adds a sixth and sometimes seventh channel to standard (non-EX) 5.1 channel Dolby Digital soundtracks.

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Dolby Digital Plus is an enhanced coding system based on the AC-3 codec. It offers increased bitrates (up to 6.144 Mbit/s), support for more audio channels (up to 13.1), improved coding techniques to reduce compression artifacts, and backward compatibility with existing AC-3 hardware.

Related Topics:
Dolby Digital Plus - Compression artifacts

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Dolby TrueHD is the next generation lossless format by Dolby, designed specifically for use in High-Definition Disc-based Media. It provides a 100 percent lossless coding technology, up to 18 Mbit/s, over eight full-range channels of 24-bit/96 kHz audio (HD DVD and Blu-ray Disc standards currently limit their maximum number of audio channels to eight), support for High-Definition Media Interface and support for extensive metadata including dialogue normalization and dynamic range control. It has been selected as the mandatory format for HD DVD and as an optional format for Blu-ray Disc.

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