“Phonofilm”的意思、由来-百科全书

词条	Phonofilm
释义	Phonofilm film 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.
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