Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-12-19
1999-03-23
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4425, 369 54, G11B 7095
Patent
active
058869638
ABSTRACT:
An automatic gain control device includes: reading unit for reading information signal from a recording medium; servo loop including servo control unit for controlling position of the reading unit with respect to the recording medium; mixing unit for mixing a disturbance signal into the servo loop; gain control unit detecting gain of the servo loop in accordance with level of the disturbance signal and varying the gain of the servo loop; and level detecting unit for discriminating whether level of the information signal read by the reading unit is higher than a predetermined level or not, wherein the mixing unit mixes the disturbance signal into the servo loop when the level of the information signal is higher than the predetermined level.
REFERENCES:
patent: 5210732 (1993-05-01), Suenaga et al.
patent: 5600615 (1997-02-01), Kiyoura et al.
patent: 5610886 (1997-03-01), Hayashi et al.
Abe Hiroyuki
Fujino Yoshifumi
Haraguchi Koichiro
Kato Seiji
Kawana Kazushige
Pioneer Electronic Corporation
Tran Thang V.
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