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Phonofilm
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 recorded electrical waveforms from a microphone, which were translated back into sound waves when the movie was projected.
The Phonofilm system, which recorded synchronized sound directly onto film, was used to record vaudeville acts, musical numbers, political speeches, and opera singers. The quality of Phonofilm was poor at first and while it improved somewhat in later years, it was never able to match the fidelity of sound-on-disc systems such as Vitaphone, or later sound-on-film systems such as RCA Photophone or Fox Movietone.
The films of de Forest were short films made primarily as demonstrations to try to interest major studios in Phonofilm. These films are particularly valuable to entertainment historians, as they include recordings of a wide variety of both well-known and less famous American vaudeville and British music hall acts which would otherwise have been forgotten.
In November 1922, de Forest founded the De Forest Phonofilm Corporation with studios at 314 East 48th Street in New York City, and offices at 220 West 42nd Street in the Candler Building. However, de Forest was unable to interest any of the major Hollywood movie studios in his invention.
To record on film, de Forest tried using a standard incandescent bulb to expose amplified sound onto film. The bulbs quickly burned out, and, even while functioning, never produced a clear recording. To reproduce his nearly inaudible soundtracks, de Forest used a photocell that could not react quickly enough to the varying light coming to it as the soundtrack passed through the sound gate, resulting in an incomplete reproduction of sound from an inadequate recording – a dual failure.
Having failed to create a workable sound-on-film system by 1921, de Forest contacted Theodore Case to inquire about using a Case Research Lab invention, the Thallofide (thallium oxysulfide) Cell, for reproducing the recorded sound. Case provided de Forest with that major upgrade and later provided him with another Case Research Lab creation, the AEO Light, to use for recording the soundtrack.
On March 12, 1923, de Forest presented a demonstration of Phonofilm to the press. On April 12, 1923, de Forest gave a private demonstration of the process to electrical engineers at the Engineering Society Building's Auditorium at 33 West 39th Street in New York City.
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Phonofilm
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 recorded electrical waveforms from a microphone, which were translated back into sound waves when the movie was projected.
The Phonofilm system, which recorded synchronized sound directly onto film, was used to record vaudeville acts, musical numbers, political speeches, and opera singers. The quality of Phonofilm was poor at first and while it improved somewhat in later years, it was never able to match the fidelity of sound-on-disc systems such as Vitaphone, or later sound-on-film systems such as RCA Photophone or Fox Movietone.
The films of de Forest were short films made primarily as demonstrations to try to interest major studios in Phonofilm. These films are particularly valuable to entertainment historians, as they include recordings of a wide variety of both well-known and less famous American vaudeville and British music hall acts which would otherwise have been forgotten.
In November 1922, de Forest founded the De Forest Phonofilm Corporation with studios at 314 East 48th Street in New York City, and offices at 220 West 42nd Street in the Candler Building. However, de Forest was unable to interest any of the major Hollywood movie studios in his invention.
To record on film, de Forest tried using a standard incandescent bulb to expose amplified sound onto film. The bulbs quickly burned out, and, even while functioning, never produced a clear recording. To reproduce his nearly inaudible soundtracks, de Forest used a photocell that could not react quickly enough to the varying light coming to it as the soundtrack passed through the sound gate, resulting in an incomplete reproduction of sound from an inadequate recording – a dual failure.
Having failed to create a workable sound-on-film system by 1921, de Forest contacted Theodore Case to inquire about using a Case Research Lab invention, the Thallofide (thallium oxysulfide) Cell, for reproducing the recorded sound. Case provided de Forest with that major upgrade and later provided him with another Case Research Lab creation, the AEO Light, to use for recording the soundtrack.
On March 12, 1923, de Forest presented a demonstration of Phonofilm to the press. On April 12, 1923, de Forest gave a private demonstration of the process to electrical engineers at the Engineering Society Building's Auditorium at 33 West 39th Street in New York City.