What is Dolby Digital Surround EX?
AnswerDolby
Digital Surround EX adds a third surround channel to the Dolby
Digital 5.1 format. The third channel is reproduced by rear
speakers, while the left and right surround channels are reproduced
by speakers to the sides. The third surround channel is matrixed
encoded onto the left and right surround channels so that no
surround information is lost when EX encoded soundtracks are
played in conventional 5.1 without a Surround EX decoder.
Dolby Digital Surround EX was first introduced in cinemas with the release
of Star Wars: Episode One—The Phantom Menace. The EX format features a
third surround channel for playback at the cinema's option over surround
speakers located behind the audience, while the left and right surround
channels are reproduced by surround speakers to the sides. To maintain
compatibility, the back surround channel is matrix-encoded onto the left
and right surround channels of the 5.1 mix so that no information is lost
when the film is played in conventional 5.1.
Surround EX soundtracks are now also found on the DVDs, and a/v receivers
are available with either THX Surround EX or Dolby Digital EX decoding
to derive the extra surround channel. As with EX films, DVDs with EX encoded
soundtracks can be played in conventional 5.1.
The benefits of Surround EX include more realistic flyover and fly-around
effects, a more stable image for atmospheres and music, and a more consistent
surround effect throughout the auditorium or home viewing area. For more
information on Dolby Digital EX in the home, click here.
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