Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the early 1920s. In 1919 and 1920, de Forest, ...
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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 ...
The Phonofilm · Lee de Forest, 1873-1961, was an inventor and scholar who made significant contributions to the science of electronic communications during the ...
Apr 12, 2017 · It is reproduced by a sensitive light detector, which converts the image into an electrical signal that can be amplified and heard through a ...
Mar 12, 2008 · Lee de Forest's Phonofilm camera marked a new era in movie production with its ability to sync sound and the moving image.
Sep 7, 2011 · This device was used to record the variable density sound track on the films made by both Case and de Forest. Even though these were Case's ...
The Phonofilm system, which recorded synchronized sound directly onto film, was used to record vaudeville acts, musical numbers, political speeches, and opera ...
Mar 12, 2023 · Exactly 100 years ago, on March 12, 1923, American inventor Lee de Forest conducted a public demonstration of his Phonofilm at a press ...
Sep 7, 2011 · The phonograph and the movie camera and projector were proven and commercially-available devices. The problem for Edison and Dickson was how to ...