Automatic gain control apparatus

Details Automatic gain control apparatus Automatic gain control apparatus

1989-12-14

1992-10-06

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, G11B 700

Patent

active

051538652

ABSTRACT:
A playback signal from an optical disk includes a track cross component which is produced when a head traverses tracks on the disk and a recorded area component produced when the head passes an area on the tracks on which data is recorded. The recorded area component is especially affected by a high frequency signal. A control signal which includes the recorded area component but not the track cross component is generated by adjusting the high frequency signal. A gain of a tracking servo control is controlled by the control signal.

REFERENCES:
patent: 4663751 (1987-05-01), Kaku et al.
patent: 4700334 (1987-10-01), Shinkai
patent: 4849953 (1989-07-01), Nomura et al.
patent: 4959823 (1990-09-01), Getreuer et al.
patent: 5003523 (1991-03-01), Wachi et al.

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