Optics: motion pictures – With sound accompaniment – Picture and sound synchronizing
Patent
1978-10-02
1980-09-02
Hayes, Monroe H.
Optics: motion pictures
With sound accompaniment
Picture and sound synchronizing
352 23, 352 31, G03B 3100
Patent
active
042204038
ABSTRACT:
Two or more motor driven systems are maintained in synchronism by a recorded wave of sine form on a tape driven by one of said systems, a signal derived from said sine wave being used to drive a stepper motor or stepper motors included in the other system or systems. The invention is particularly applicable to the synchronization of a film passing through a camera or projector with a sound track recorded on a magnetic tape, or of a number of films passing through a plurality of projectors or cameras. By converting the sine wave to pulses and maintaining a count of the pulses, (a) derived from the control signal and (b) supplied to the stepper motor, synchronism is maintained despite inertia effects during repeated starting, stopping and reversal of the drive.
REFERENCES:
patent: 3441342 (1969-04-01), Ball et al.
patent: 3563641 (1971-02-01), Ryder
patent: 3740125 (1973-06-01), Harris
patent: 3743392 (1973-07-01), Numata et al.
patent: 3979774 (1976-09-01), Chen et al.
patent: 3999842 (1976-12-01), Niederhauser et al.
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