In the mid-1920s, recordings made with mechanical recordings were used to record and restore sound for sound movies. For example, the sound story films "Don Juan" (1926) and "Jazz Singer" (1927) made in the United States are recorded by mechanical means. The earliest Chinese feature films "Song Red Peony" and "The Beauty" were also recorded in this way. Although the mechanical recording played a certain role in the early stage of the development of sound films, because the records and films are separate, when the theater is shown, the sound and picture are often out of sync. Even the picture is already finished, and the sound on the record continues.
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