Dolby Surround

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It has been suggested that this article or section be merged with Dolby Stereo. (Discuss)

It has been suggested that this article or section be merged with Dolby Pro Logic. (Discuss)

Dolby Surround was the earliest consumer version of Dolby's multichannel analog film sound format Dolby Stereo.

When a Dolby Surround soundtrack is produced, four channels of audio information—left, center, right, and mono surround—are matrix-encoded onto two audio tracks. The stereo information is then carried on stereo sources such as videotapes, laserdiscs and television broadcasts from which the surround information can be decoded by a processor to recreate the original four-channel surround sound. Without the decoder, the information still plays in standard stereo or monaural. The Dolby Surround decoding technology was updated during the 1980s and re-named Dolby Pro Logic. The terms Dolby Surround and LtRt are used to describe soundtracks that are matrix-encoded using this technique.

j = + 90º phase-shift , k = - 90º phase-shift

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