Electronic system for synchronizing motion picture and sound rec

Details Electronic system for synchronizing motion picture and sound rec Electronic system for synchronizing motion picture and sound rec

1976-06-21

1980-01-15

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

352 5, G03B 3100

Patent

active

041836324

ABSTRACT:
An electronic system is disclosed that is particularly useful for synchronizing motion picture and sound recordings. The system includes a sensor that is positioned contiguous to a movie camera during filming and contiguous to a movie projector during film playback to sense a characteristic indicative of film movement and, responsive thereto, producing an electrical output signal. During filming, a sensor, such as a microphone or induction coil, may be positioned contiguous to the movie camera such as by placing the sensor in a cylinder screwed into a camera tripod socket. During playback, the sensor, such as a light sensor, may be positioned to sense light bursts of a running movie projector. A control unit receives the electrical output signal from the sensor and utilizes the same in controlling operation of an associated tape recorder. During filming, the control unit controls operation of the associated tape recorder and causes a timing signal to be recorded on the tape for synchronizing purposes with sound associated with the motion picture also being recorded on the tape recorder. In the control unit, the electrical output signals produced by the sensor during filming is processed utilizing envelope detection as well as filtering in a band pass filter to produce the desired timing signal for synchronization purposes. During playback, the electrical output signal from the sensor and the timing signal from the tape recorder are processed and coupled to counters the output from which controls operation of the tape recorder to automatically achieve and maintain synchronization of picture and sound during playback.

REFERENCES:
patent: 2679187 (1954-05-01), Bitting
patent: 3049965 (1962-08-01), Gunst
patent: 3492068 (1970-01-01), Baron
patent: 3588558 (1971-06-01), Levin
patent: 3743392 (1973-07-01), Numata
patent: 3813153 (1974-05-01), Roth
patent: 3940208 (1976-02-01), Roth

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