发明名称 |
Servo circuit for a signal reproducing apparatus |
摘要 |
A servo circuit for a signal reproducing apparatus for reproducing signals from a record medium such as a disc utilizing an optical pickup, wherein a variable gain amplifier is arranged in a servo loop between a pickup and an actuator so that the pickup is caused to track a signal track in accordance with a servo error signal produced by the variable gain amplifier. A playback condition of a disc is discriminated by detecting the number of errors in a signal reproduced from a recorded signal on the disc by the pickup, and a gain of the variable gain amplifier is controlled by the discrimination output so that the variation of the servo error signal caused by a difference in reflectance between individual discs is eliminated and a loop gain appropriate to an individual disc is automatically set.
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申请公布号 |
US4580255(A) |
申请公布日期 |
1986.04.01 |
申请号 |
US19830499245 |
申请日期 |
1983.05.31 |
申请人 |
HITACHI, LTD. |
发明人 |
INOUE, SHIGEKI;ARAI, TAKAO;FUKUI, YUKIO;TAKEUCHI, TAKASHI;NAKAGAKI, HARUSHIGE;NAKAMURA, MASAFUMI;BABA, TATSUO |
分类号 |
G11B7/09;G11B19/04;G11B20/10;G11B21/10;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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