Optical sound recording system with inversely polarized sound si

Details Optical sound recording system with inversely polarized sound si Optical sound recording system with inversely polarized sound si

1977-02-22

1978-05-02

Wolff, John H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358132, 1791003A, H04N 584, G11B 702

Patent

active

040876519

ABSTRACT:
An optical sound recording system of modified variable area type, wherein a light beam, preferably a laser beam, is pulse-width modulated in response to sound signals and deflected at a high frequency beyond audible range and then recorded on a sound track of cinema film. The pulse-width modulation of the light beam is performed in such a manner that a carrier wave having the same frequency, phase, and wave form to those of the deflection of the light beam and being clipped on both sides of amplitude by a pair of sound signals polarized inversely with each other and biased positively and negatively is used for gating the light beam. Consequently a high quality optical sound recording system unrelated to the carrier waveform used for the pulse-width modulation can be realized.

REFERENCES:
patent: 3335219 (1967-08-01), Goldmark et al.
patent: 3819874 (1974-06-01), Fujio
patent: 3854005 (1974-12-01), Castrignano

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