11 Facts About Dolby Digital


Dolby Digital Laboratories adapted the MDCT algorithm along with perceptual coding principles to develop the AC-3 audio format for cinema needs.

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Dolby Digital was the earliest MDCT-based audio compression standard to be released, and was followed by other MDCT-based audio compression standards for home and portable usage, such as Sony's ATRAC, the MP3 standard and AAC.

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All film prints with Dolby Digital data have Dolby Stereo analogue soundtracks using Dolby SR noise reduction and such prints are known as Dolby SR-D prints.

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Dolby Digital is the common version containing up to six discrete channels of sound.

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Dolby Digital EX is similar in practice to Dolby's earlier Pro Logic format, which utilized matrix technology to add a center surround channel and single rear surround channel to stereo soundtracks.

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Dolby Digital Live is a real-time encoding technology for interactive media such as video games.

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However, Dolby Digital Live is still useful with HDMI to allow transport of multichannel audio over HDMI to devices that are unable to handle uncompressed multichannel PCM.

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Dolby Digital Live is available in sound cards using various manufacturers' audio chipsets.

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Many Dolby Digital decoders are equipped with downmixing to distribute encoded channels to speakers.

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Dolby Digital audio is used on DVD-Video and other purely digital media, like home cinema.

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Dolby Digital is part of a group of organizations involved in the development of AAC, part of MPEG specifications, and considered the successor to MP3.

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