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 (Object Based)
Introduced in 2012, Atmos allows audio "objects" to be positioned in 3D space. For details, see Dolby Atmos.
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References in periodicals archive ?
Dolby Digital Plus is an advanced surround sound audio technology that's built into home theaters, smartphones, operating systems, and browsers.
Dolby Digital Plus is developed for and embraced by artists, operators, carriers, and device makers worldwide and is now available on more than one billion products, including HDTVs, smartphones, tablets, PCs, game consoles, and Blu-ray Disc players, Chao said.
To counter that, Caraeff says that VEVO allocates more bandwidth to the audio in its streams and is also using more efficient codecs, such as Dolby Digital Plus.
Audio codecs supported include: MP3, AAC-LC, HE-AAC, WMA, AC-3, RealAudio, Dolby Digital Plus, Dolby TrueHD, DTS, DTS-HD MA, DTS-HD HR and others.
Prize: 50in Panasonic plasma TV (rrp pounds 1499), Panasonic Dolby Digital and DTS home entertainment system (rrp pounds 399) and Stray on DVD (rrp pounds 15.99).
Strongly recommended as a unique contribution to the film genre of horror cult classics, the DVD format of Horror House On Highway 5 is enhanced with Dolby Digital Sound and features the bonus segment of "The History of Hollywood Horror Films" and "The Horror House Original Theatrical Trailer".
Camera (color), Lai Yiu-fai; editor Jeff Cheung; music, Tommy Wai; art director, Alex Mok; sound (Dolby Digital), Chen Chi-kien.
The Levinson surround-sound system optimizes discrete 5.1 Dolby Digital playback for each seating position, The result is outrageous, whether your source is iPod, DVD, or CD.
Circuit City: LG 600-Watt Dolby Digital and Pro Logic 5.1 Channel Home Theater System, $349.99
DVR-310-S also has superior audio features, such as Dolby Digital and DTS surround sound outputs and is compatible with CD, MP3 and WMA formats.
Namely, while the 96 kHz, 24-bit (Meridian Lossless Packing) DVD-A and 448 kbps Dolby Digital tracks offer up the usual "audience" perspective, the 1509 kbps DTS tracks offer a "stage" perspective that puts the listener right in there with the musicians.