Arrangement for compensating duty factor variations in an optica

Details Arrangement for compensating duty factor variations in an optica Arrangement for compensating duty factor variations in an optica

1975-04-02

1976-10-26

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

178 66DC, 178 66TC, 1791003V, 360 36, 360 38, H04N 576, G11B 700

Patent

active

039885321

ABSTRACT:
Processing optical video discs may result in modulation of the duty factor of the pits and lands which constitute a spatial representation of a stored carrier signal frequency modulated with program information. Such modulation of duty factor introduces spurious components that are detrimental to image reproduction if the frequency of the stored carrier signal is not at least twice the highest video frequency component to be reproduced. A correction signal is developed and used to at least partially cancel the effect of such spurious components.

REFERENCES:
patent: 3571526 (1971-03-01), Stockwell
patent: 3893168 (1975-07-01), Bechley et al.
patent: 3906152 (1975-09-01), Hoogendisk

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