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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, 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 photographically ...
Sound-on-film is a class of sound film processes where the sound accompanying a picture is recorded on photographic film, usually, but not always, the same strip of film carrying the picture. Sound-on-film processes can either record an analog sound track or digital sound track, and may record the signal either optically or magnetically ...
A fourth major contender for the sound film market - Warner Brothers' Vitaphone sound-on-disc system which synchronized large-size (16") phonographic records with a film's projector was used on early talkies, such as their' 1927 hit The Jazz Singer (which was marketed as being "all singing" though the talking was sporadic, used in only several ...
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Left: Movietone sound track with variable density recording, similar to Tri-Ergon. Right: Variable area track as used by RCA Photophone. The Tri-Ergon process involved recording sound onto film using the "variable density" method, used by Movietone and Lee De Forest's Phonofilm, rather than the "variable area" method later used by RCA Photophone.
"Chicken Fat" was the theme song for President John F. Kennedy's youth fitness program, and millions of 7-inch 33 RPM discs which were pressed for free by Capitol Records were heard in elementary, junior high school and high school gymnasiums across the United States throughout the 1960s and 1970s. [2]
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