Scanning system for reproduction of optical sound tracks with cl

Details Scanning system for reproduction of optical sound tracks with cl Scanning system for reproduction of optical sound tracks with cl

1977-03-18

1980-09-16

Cardillo, Raymond F.

1791003R, G11B 700

Patent

active

042231884

ABSTRACT:
A variable area sound track is scanned laterally to derive width-modulated pulses which can be demodulated to audio. In order to eliminate the effect of noise on the clear area of the track, each pulse is initiated by a black-to-clear transition sensed in the scanning but is not terminated until it is certain that the clear-to-black transition has been reached, e.g. at reference instants of time.

REFERENCES:
patent: 2025027 (1935-12-01), Donle
patent: 2049384 (1936-07-01), Hogan
patent: 2184525 (1939-12-01), Ives
patent: 2347084 (1944-04-01), Cooney
patent: 2485829 (1949-10-01), Holst et al.
patent: 2538869 (1951-01-01), Holst
patent: 2575445 (1951-11-01), Germer
patent: 3138669 (1964-06-01), Rabinow et al.

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