System for compensating for incorrect duty factor when reading o

Details System for compensating for incorrect duty factor when reading o System for compensating for incorrect duty factor when reading o

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

039885313

ABSTRACT:
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 compensating 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.

REFERENCES:
patent: 3347984 (1967-10-01), Holmberg
patent: 3906152 (1975-09-01), Hoogendisk
patent: 3911476 (1975-10-01), Keizer
patent: 3912858 (1975-10-01), Kenney
Hnnan et al., Automatic Correction of Timing Errors in Magnetic Tape Recorders, IEEE Transactions on Military Electronics, 7-10/65, pp. 246-254.
Edwardson, The Digital Timing-Connection of Video Tape Recorded Color Television, Proceedings of the Conf. on Video and Data Recording, 10-12 July 73, pp. 27-39.

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