Dolby stereo

Dolby stereo
  a stereo-sound process for motion pictures created by Dolby Laboratories, Inc., used to improve sound quality; 35mm prints have two optical sound tracks (Dolby can decode and playback on four channels), while 70mm prints have six magnetic tracks for multi-channel playback; by the 1990s, Dolby Stereo was superceded by advanced digitally-recorded sound
  Examples: The first Dolby encoded stereo-optical soundtrack on a feature film was Ken Russell's Lisztomania (1975). Other Dolby stereo soundtracks existed for Star Wars (1977), Apocalypse Now (1979), Close Encounters of the Third Kind (1977), and Superman (1978).

Glossary of cinematic terms . 2015.

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