Optics: motion pictures – With sound accompaniment – Picture and sound synchronizing
Patent
1975-02-13
1977-09-27
Hayes, Monroe H.
Optics: motion pictures
With sound accompaniment
Picture and sound synchronizing
352 13, 352 21, 352 31, G03B 3100
Patent
active
040507947
ABSTRACT:
A system for synchronizing projection of a movie film with playback of a sound recording made simultaneously with filming of the movie by simple and economical adapter means compatible with existing camera, projector and sound equipment without substantial modification. The invention utilizes "home movie" type camera and projector equipment, with a tape recorder-playback unit as the sound system. The camera is powered from a power supply having a switch operated by the "play" button of the tape recorder, thereby starting and stopping operation of the camera and tape unit simultaneously during filming and recording. The tape drive motor is powered from a selectively controllable voltage supply, and is not connected to the supply through the normal electrical system of the tape unit, as is conventional. Momentary switches in the lines of each of the projector and tape drive motor are provided to allow the operator to interrupt power to either for a short period to restore synchronism in one disclosed embodiment. In another embodiment, synchronism is restored during projection and sound playback by either speeding up or slowing down the tape drive motor. Also disclosed are means for starting the tape unit for playback in synchronism with the beginning of film projection either manually or automatically.
REFERENCES:
patent: 1605529 (1926-11-01), Case
patent: 2503083 (1950-04-01), Waller
patent: 2982172 (1961-05-01), Berkenhoff
patent: 3207033 (1965-09-01), Guber
patent: 3244469 (1966-04-01), Hennessey
patent: 3429640 (1969-02-01), Machtig
patent: 3594077 (1971-07-01), Marquis
patent: 3694060 (1972-09-01), Tadie
Hayes Monroe H.
Mc Guire Charles S.
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