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 ?
1, offered with Hercules' Game Theater XP, is the world's first software DVD player to be certified for Dolby Digital EX and is a perfect example of how Dolby's new standards continue to be adopted in leading brand consumer entertainment products.
LINK Yes Yes -- -- MCACC Yes Yes Yes -- (Advanced) (Refined) (Refined) Dolby Digital EX Yes Yes Yes Yes DTS-ES Yes Yes Yes Yes THX Yes Yes Yes Yes (THX Ultra2) (THX Select) (THX Select) DTS-96/24 Yes Yes Yes Yes NEO-6 Yes Yes Yes Yes Dolby Pro Logic IIx Yes No No No Motorola DSP Yes Yes Yes -- (Dual) (Dual) SHARC Yes -- -- -- Air Studios Certification Yes Yes Yes -- Advanced Yes Yes Yes -- Direct Energy 130W x 7 100W x 7 100W x 7 110W x 6 MOSFET @ 8 ohms @ 8 ohms @ 8 ohms @ 8 ohms Amplifiers 160W x 7 @ 6 ohms 3-D space frame construction Yes Yes Yes --
However, with the introduction of Dolby Digital EX, home theatre enthusiasts began integrating two rear speakers with their side surrounds," Eggers continued.
Dolby Digital EX technology employs highly advanced Dolby matrix decoding to add a third surround channel to Dolby Digital 5.
With Dolby Digital EX, the center-rear data is derived from the L+R component contained within the stereo-surround signals available with specially configured, 5.
The model is compatible with the latest audio codecs (Dolby Digital Plus, Dolby TrueHD, DTS HD, DTS ES, Dolby Digital EX, Dolby Pro Logic IIx and 8 channel Linear PCM) and supports HD Digital Cinema Sound, 1080/24p video output as well as Deep Color and x.
Both systems feature the Dolby Master Studio suite of technologies, including Dolby Digital EX, Dolby Digital Live, Dolby Pro Logic(R) IIx, Dolby Headphone, and Dolby Virtual Speaker, with support for up to 7.
All eight theaters are outfitted with Dolby Digital EX sound systems, higher gain, wall-to-wall screens and superior projection technology, including high-end reflectors and top-of-the-line projector lenses.
Designed to provide additional PC system audio value, Dolby-approved SigmaTel Theater Quality HD Audio codecs enable system-wide access to Dolby premier technologies including Dolby Digital EX, Dolby Pro Logic(R) IIx, Dolby Headphone, Dolby Virtual Speaker, and Dolby Digital Live.
Designed for Dolby Home Theater and Designed for Dolby Master Studio mainboard offerings from Abit, Asus, Gigabyte, Intel, and MSI feature Dolby technologies including Dolby Digital EX, Dolby Digital Live, Dolby Pro Logic(R) IIx, Dolby Headphone, and Dolby Virtual Speaker.
Meanwhile, TI has developed implementations of all of the firm's world- renowned audio technologies including Dolby Digital, Dolby Digital Ex, Pro Logic II, Pro Logic IIx, Dolby Headphone and Dolby Virtual Speaker.