Dolby stereo is identified as a commercial film sound process that allows four individual soundtrack channels (Left, Center, Right, Surround) to be recorded onto a 35mm film print using only two optical soundtracks, and then recovered when the film is projected.
Dolby stereo uses an analog active matrix encode/decode process and either Dolby A-type or Dolby SR-type Noise Reduction to achieve high fidelity surround sound in motion picture theaters.
Ref: 123306/2006-09-27
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Dolby stereo digital (Dolby stereo digital also called dolby SR-D, ...)