Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent
1982-08-04
1984-07-24
Adams, Russell E.
Optics: motion pictures
With sound accompaniment
Common picture and sound record carrier systems
352 11, G03B 2308
Patent
active
044615523
ABSTRACT:
An electro-optical, motion picture, film sound track recording and playback system in which a complex audio signal wave is successively sampled and digitally encoded according to pulse-code modulation techniques (PCM) extant in the communications art. The digital codes are optically applied to the film sound track and are played back by optical detection as the film runs through a projector. The advantages of PCM signal-to-noise improvement are obtained, and means for the individual sample codes to be "scrambled" on recording and "unscrambled" on replay are shown. The scrambling greatly increases the difficulty of surreptitious copying by "film pirates". One embodiment shown applies and detects the individual code bits through individual optical fibers and the other applies and detects codes serially using a modulated laser source and a controllable refraction optical crystal or a Bragg Cell to scan across the sound track to emplace (and replay) individual sample codes.
REFERENCES:
patent: 3441949 (1969-04-01), Rolon
patent: 3932032 (1976-01-01), Weinstein
patent: 4032224 (1977-06-01), Wray
patent: 4256389 (1981-03-01), Engebretson
Adams Russell E.
Hertz Harvey S.
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