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Sound-on-disc is a class ofsound film processes using aphonograph or other disc to record or play back soundin sync with amotion picture. Early sound-on-disc systems used a mechanicalinterlock with themovie projector, while more recent systems usetimecodes.
During the 1920s and early 1930s, films in the United States were subject tocensorship by state and city censor boards, which often required cuts of scenes before a film would be licensed for exhibition. While films using thesound-on-film process could accommodate a patch for a requested cut with ease, a film using sound-on-disc would require an expensive retake.[2] If the cost of compliance with a censor board was too high, the film would not be shown in that state or city.
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