Dolby Stereo is a sound format made by Dolby Laboratories. There are two basic Dolby Stereo systems: the Dolby SVA (stereo variable-area) 1976 system used with optical sound tracks on 35mm film, and Dolby Stereo 70mm which refers to Dolby noise reduction on 6-channel magnetic soundtracks on 70mm prints.
Dolby SVA was adapted for home use in 1982 as Dolby Surround when HiFi capable consumer VCRs were introduced, and further improved in 1987 with the Dolby Pro Logic decoding system (see the Dolby Surround/Dolby Pro Logic (home decoders) section).
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