Optical disc reproducing apparatus having an automatic gain cont

Details Optical disc reproducing apparatus having an automatic gain cont Optical disc reproducing apparatus having an automatic gain cont

1990-11-13

1992-07-07

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 4428, 369 4429, 369 4435, 369 4436, G11B 700

Patent

active

051289113

ABSTRACT:
An appparatus for preventing an undesirable increase in the gain of an automatic gain control circuit (AGC circuit) when an optical pickup of an optical disc reproducing apparatus performs a track jump operation. A detected signal of an optical pickup is applied to an AGC circuit for equalizing the level of the detected signal. The output of the AGC circuit is detected by an envelope detector and compared with a reference level by a comparator. The output of the comparator is applied to the AGC circuit as a gate signal for holding the gain of the AGC circuit to a predetermined value during tracing of a nonrecorded part of a track. Additionally, a jump signal, which is output from a jump signaling device during a track jump operation of the optical pickup, is applied to the AGC circuit to hold the gain to a predetermined value during a track jump operation.

REFERENCES:
patent: 4340950 (1982-07-01), Kosaka
patent: 4544872 (1985-10-01), Hirano et al.
patent: 4580255 (1986-04-01), Inoue et al.
patent: 4750161 (1988-06-01), Takeuchi et al.
patent: 5007038 (1991-04-01), Nakane et al.

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