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Phonofilm
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Phonofilm
Phonofilm De Forest Phonofilm crew on the grounds of the White House, Washington, D.C., 1924.

Phonofilm

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sound-on-film system
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Phonofilm, system used in the 1920s to provide sound synchronized with motion pictures. A sound track was photographically recorded on the film by a beam of light modulated by the sound waves. The sound was reproduced during projection by directing a beam of light through the sound track onto a photocell, the response of which was electronically amplified.

This article was most recently revised and updated by Amy Tikkanen.