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 passed 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 1923.