AGC circuit for optical disk data reproducing apparatus using AL

Details AGC circuit for optical disk data reproducing apparatus using AL AGC circuit for optical disk data reproducing apparatus using AL

1990-12-27

1993-04-13

Sniezek, Andrew L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 4435, 369116, G11B 7125

Patent

active

052028739

ABSTRACT:
Data read from an optical disk includes an address period, an ALPC period and a data period, in which the ALPC period contains a no-signal state at opposite ends of a laser output signal. An ALPC period detector is provided for detecting the ALPC period. During the ALPC period, an automatic gain control circuit is suspended to hold the gain to the predetermined value. Alternatively, during the ALPC period, the signal applied to the automatic gain control circuit is reduced to ground level or is attenuated. Thus, since the automatic gain control circuit will not be adversely affected by the laser output signal and no-signal state in the ALPC period, the automatic gain control circuit will amplify the signal in the data period with an appropriate gain.

REFERENCES:
patent: 4831626 (1989-05-01), Watanabe et al.
patent: 4855988 (1989-08-01), Shinbayashi et al.
"Interim Version of DIS 10089", ISO/IEC JTCI Information Technology, Jul. 1990.

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