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Dolby Surround

   Also found in: Wikipedia 0.11 sec.

A digital audio encoding system from Dolby that provides four channels. Derived from the Dolby Stereo technology used in movie theaters, Dolby Surround was introduced in the early 1980s for video soundtracks, audio cassettes, CDs, TV broadcasts, video games and PC software.

Dolby Pro Logic
The original Dolby Surround decoders in consumer equipment only played back the surround channel. Dolby Pro Logic was introduced shortly after for playback of the center channel as well. Pro Logic II added left and right surround channels (5.1), and Pro Logic IIx added support for 6.1 and 7.1 channels. See Dolby Digital.


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Flicker-free viewing with 100Hz processing is also possible and Virtual Dolby Surround Sound is built-in with an optical output for connection to an appropriate A/V system for full surround sound.
Dolby Digital AC-3 sound is encoded into laserdiscs, but not on the more popular videotapes, which utilize the four-channel Dolby Surround sound.
The Night At The Museum two-disc Special Edition DVD is presented in widescreen format with Dolby Surround 5.
 
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