Dolby stereo digital also called dolby SR-D, dolby digital or or dolby DD is a commercial film sound process that allows six individual soundtrack channels (Left, Center, Right, Left Surround, Right Surround, LFE or Subwoofer) to be optically printed onto a 35mm film and reproduced in commercial movie theaters. Dolby stereo digital offers considerably improved audio performance over dolby stereo.
Ref: 123307/2006-09-27
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Dolby stereo (Dolby stereo is identified as a commercial film. ..)
Digital (Digital refers to a signal that consists of ...)