The term Sound-on-disc refers to a class of sound film processes utilizing a phonograph or other disc to record or playback sound in sync with a motion picture. Early sound-on-disc systems used a mechanical interlock with the film projector, while more recent systems use timecode.

Sound-on-disc processes:

• Vitaphone introduced by Warner Brothers in 1926
• Phono-Kinema short-lived system invented by Orlando Kellum in 1921
• Digital Theater Sound

See also: sound-on-film

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