Phonofilm is a optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the 1920s. ==Introduction== In 1919 and 1920, Lee De Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines. These parallel lines photo...
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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 ... [3 related articles]
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