System for compensating for incorrect duty factor when...

Details System for compensating for incorrect duty factor when... System for compensating for incorrect duty factor when...

H - Electricity

04

N

352/32.1

H04N 5/76 (2006.01) G11B 7/00 (2006.01) G11B 23/00 (2006.01) H04N 5/93 (2006.01)

Patent

CA 1089984

ABSTRACT OF THE DISCLOSURE In an optical video disc where the storage track is a succession of cavities or pits alternating with a like succession of lands, these elements ideally have a certain length, determined by the encoding method used. Experience shows, however, that they may in practice suffer unintended length variations giving rise to duty factor error. A com- pensating change is made to the duty factor of the signal developed in reading the disc in order to obviate spurious components attributable to duty factor error and otherwise the source of distortion in image reproduction. -1-

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