Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-11-09
1998-06-02
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4425, 369 4429, 369 4432, G11B 7085
Patent
active
057611645
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: 4740679 (1988-04-01), Doi
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 4982392 (1991-01-01), Soejima
patent: 5014256 (1991-05-01), Horie et al.
patent: 5293365 (1994-03-01), Rokutan
patent: 5347501 (1994-09-01), Iimura
Abe Hiroyuki
Fujino Yoshifumi
Haraguchi Koichiro
Kato Seiji
Kawana Kazushige
Pioneer Electronic Corporation
Tran Thang V.
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