Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term Sound-on-disc refers to a class of sound film processes using 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. A sound film is a motion picture with synchronized sound, or sound technologically coupled to image, as opposed to a silent film. The first known public exhibition of projected sound films took place in Paris in 1900, but decades would pass before sound motion pictures were made commercially practical. Reliable synchronization was difficult to achieve with the early sound-on-disc systems, and amplification and recording quality were also inadequate. Innovations in sound-on-film led to the first commercial screening of short motion pictures using the technology, which took place in New York City in April 1923.

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