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Many DVD releases have Dolby Digital tracks up to 5.1 channels, due to the implementation of Dolby Digital in the development of the DVD format. In addition, some DVDs have DTS tracks, with most being 5.1 channel mixes (a few releases, however, have 6.1 "matrixed" or even discrete 6.1 tracks).
For Dolby Atmos, the nomenclature differs slightly by an additional number at the end, that represents the number of overhead or Dolby Atmos enabled speakers: a 7.1.4 Dolby Atmos system is a conventional 7.1 layout with four overhead or Dolby Atmos enabled speakers.
Dolby Atmos (and other Microsoft Spatial Sound engines; see AudioObjectType in SpatialAudioClient.h) additionally support a virtual "8.1.4.4" configuration, to be rendered by a HRTF. [46] The configuration adds to 7.1.4 with a center speaker behind the listener and 4 speakers below.
The theater version of Dolby Digital Surround EX was introduced in 1999, when Dolby and THX, a division of Lucasfilm Ltd., co-developed Dolby Digital Surround EX™ for the release of Star Wars: Episode I – The Phantom Menace. [21] [26] Dolby Digital Surround EX has since been used on the DVD releases of the Star Wars prequel and original ...
In July 2014, Dolby Laboratories announced plans to bring Atmos to home theater. The first television show to use the technology on disc was Game of Thrones . On February 24, 2014, Dolby acquired Doremi Labs for $92.5 million in cash plus an additional $20 million in contingent consideration that may be earned over a four-year period.
Typical layout of loudspeakers in a 5.1 home theater loudspeaker system. Block diagram of a 5.1 channel bass management system, with nominal filtering characteristics. There are notation differences between the pre-bass-managed signal and after it has passed through the bass manager. For example, when using 5.1 surround sound: [2] [3]