Control information detecting method and apparatus in optical-ty

Details Control information detecting method and apparatus in optical-ty Control information detecting method and apparatus in optical-ty

1979-01-30

1982-01-12

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 360 77, 250201, 250202, H04N 576, G11B 700

Patent

active

043109110

ABSTRACT:
For focus and tracking controls for a pickup of an optical-type video disc player, wobbles are simultaneously applied to focus and tracking adjustment mechanisms. The wobble for focus and the wobble for tracking are effected by two signals 90.degree. phase-shifted from each other. The respective informations representative of focus and tracking errors are separately detected in a synchronous detection manner using the same two signals to provide focus and tracking control signals.

REFERENCES:
patent: 3848095 (1974-11-01), Wohlmut
patent: 3876827 (1975-04-01), Jonssen
patent: 3932700 (1976-01-01), Snopko
patent: 3952191 (1976-04-01), Linet
patent: 3985952 (1976-10-01), Adler
patent: 4032776 (1977-06-01), Von Rosmalen
patent: 4063287 (1977-12-01), Von Rosmalen
patent: 4074312 (1978-02-01), Rosmalen
patent: 4118735 (1978-10-01), Wilkinson
patent: 4193091 (1980-03-01), Kleuters
Journal of SMPTEE; vol. 83, (Jul. 1974) pp. 564-579.

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