Dolby Digital


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Dolby Digital

A family of digital audio encoding technologies from Dolby used in movie theaters, home theaters and video games. Introduced in the movie "Batman Returns" in 1992, Dolby Digital has been the most widely used surround sound system in the world. Following are the major formats. See Dolby Surround and surround sound.

Dolby Digital - 5.1 Channels
Five discrete channels of audio plus subwoofer (see surround sound). Dolby Digital employs Dolby's AC-3 coding and compression technology (see AC-3).

Dolby Digital EX - 6.1 and 7.1 Channels
Co-developed with Lucasfilm THX, Dolby Digital EX adds one or two matrixed rear center channels. Formerly "Dolby Digital Surround EX," the first film to use this enhanced version of Dolby Digital was "Star Wars: Episode I - The Phantom Menace," in 1999.

Dolby Digital Plus - 6.1 and 7.1 Channels
Part of the Blu-ray specification, Dolby Digital Plus supports higher bit rates than EX. Also called "DD+" and "Enhanced AC-3" (E-AC-3).

Dolby TrueHD - 7.1 on Blu-ray
Providing up to 14 discrete sound channels in the complete specification, TrueHD used in Blu-ray movies delivers stereo at 192 kHz and up to eight channels (7.1) at 96 kHz. Introduced in 2006, Dolby TrueHD competes with DTS-HD for high-definition Blu-ray audio formats. HDMI 1.3 cables are required. See Blu-ray, DTS and HDMI.

Dolby Atmos - 9.1 Channels
Introduced in 2012, Atmos supports 128 audio tracks and up to 64 speakers in the cinema, although home theaters require at least a 5.1 system plus two "height speakers" that can either be ceiling mounted or "upward firing." Transformers: Age of Extinction was the first Atmos Blu-ray movie. Touted as "object-based surround sound," rather than "front and back surround," DTS:X was introduced with a similar approach (see DTS).
References in periodicals archive ?
The crystal clear images presented with the Dolby Digital Cinema system are a tremendous enhancement for our patrons," said Rob Kurrus, President of Premiere Theaters L.
It also accommodates other audio coding formats from nonfilm sources, including PCM, Dolby Digital, Dolby E, Dolby Pro Logic([R]), and Dolby Pro Logic II.
Dolby Digital Plus is a next-generation audio technology that is fully compatible with Dolby Digital.
Additionally, all of their existing and future home videos recorded with Dolby Digital Plus audio will work great on Windows 8 right out of the box," he said.
Dolby Digital has been acknowledged to be the standard for upcoming high-definition television, and ``that pretty much solidified Dolby Digital's position in the marketplace,'' Griffin said.
Last year, 67 films were released using DTS technology, compared to 122 Dolby Digital titles and 66 using SDDS.
We are delighted to offer chip designs with Dolby Digital Plus and applaud Dolby's efforts to make its technologies more accessible to licensees in China," said Vincent Huang, Vice President and CTO, Nationalchip.
Dolby is excited to work closely with Interra Systems to enhance its Vega family of media analyzers for advanced analysis of encoded audio with Dolby Digital Plus and Dolby Digital," said Sabine Bravo, Senior Manager, Global Sales Programs at Dolby Laboratories.
Available on the Windows 7 Home Premium, Professional, Enterprise, and Ultimate editions, Dolby Digital Plus will deliver home theater-quality audio to the PC, improving the listening experience of music, movies, or videos.
Television Numerique Terrestre HD chooses Dolby Digital Plus and Dolby Digital
Dolby Showcases Broad Industry Support for Dolby TrueHD and Dolby Digital Plus Audio Technologies for High-Definition Entertainment
InfoGard Laboratories, an accredited Cryptographic Module Testing Laboratory under Lab Code 100432-0 of the National Voluntary Laboratory Accreditation Program, submitted the recommendation for the Dolby Digital Cinema server to the National Institute of Standards and Technology (NIST) for FIPS 140-2 Level 3 validation, as outlined by the Digital Cinema Initiative (DCI) specifications.