- published: 07 Jun 2012
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Dolby Surround was the earliest consumer version of Dolby's multichannel analog film sound decoding format Dolby Stereo introduced to the public in 1982 during the time home video recording formats (such as Betamax and VHS) were introducing Stereo and HiFi capability. The term Dolby Surround is used so as not to confuse theater surround (Dolby SR, which has four channels of audio) with home stereo, which has only two. Dolby Surround is the earliest domestic version of theatrical Dolby Stereo. The term also applies to the encoding of material in this sound format.
When a Dolby Stereo/Dolby Surround soundtrack is produced, five elements of audio information (left, center, right, sub and surround) are matrix-encoded two channels with stereo playback compatibility. The stereo information is carried on stereo sources such as VHS TV, DVD's, 35mm Theatrical Print Optical Soundtrack, Television Broadcasts from which the surround information can be decoded by a processor to recreate the original Dolby Surround (left, center, right, sub and surround) mix. Without the decoder, the information still plays in standard stereo in great quality or in mono with good quality.
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