Title: Scanning system for reproduction of optical sound tracks with clear area noise discriminator delay means

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.

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Inventors: Dolby, Ray M. (San Francisco, CA, US)

Application Number: 967878
Filing Date: 1978-12-04
Publication_date: 1980-01-15
Assignee: Dolby Laboratories, Inc. (San Francisco, CA)
Primary Class(es): 369/107 369/97
Other Classes:
US Patent Ref:

2025027	Dec, 1935	Donle	358/204.
2049384	Jul, 1936	Hogan	358/214.
2184525	Dec, 1939	Ives	358/202.
2347084	Apr, 1944	Cooney	179/100.
2485829	Oct, 1949	Holst et al.	179/100.
2538869	Jan, 1951	Holst	179/100.
2575445	Nov, 1951	Germer	179/100.
3138669	Jun, 1964	Rabinow	179/100.

Other Refs:
Primary Examiner: Cardillo, Jr., Raymond F.
Assistant Examiner:
Attorney: O'Connell; Robert F.