Information recording and reproducing device with reproduction a

Details Information recording and reproducing device with reproduction a Information recording and reproducing device with reproduction a

1990-09-11

1994-11-01

Psitos, Aristotelis

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 54, 369124, 369 58, 369 4435, G11B 700

Patent

active

053612477

ABSTRACT:
An information recording and reproducing device having an automatic gain control device wherein its amplification degree is adjusted according to an AGC voltage varying with an amplitude of a reproduced signal. The automatic gain control device has a holding circuit which holds the AGC voltage in each of recording and erasing operations, and also holds the AGC voltage in reproducing an un-recorded area of information. The AGC voltage is also used for determining an optimum recording condition for a recording medium. Instead of the holding circuit, by installing a limiter circuit for limiting an amplitude of a reproduced signal, and by the use of transient response of the reproduced signal due to an coupling situated before the limiter circuit, an appropriate amplification degree can also be obtained in the automatic gain control device. Further, the limiter circuit which is disposed at a stage before a reproduction circuit and also before a capacitor having the ac coupling, may restrain influence of the transient response of the ac coupling given on the reproduced signal, thereby making it possible to reproduce a signal with small amplitude immediately after recording or erasing operation.

REFERENCES:
patent: 4509155 (1985-04-01), Masuda et al.
patent: 4611317 (1986-09-01), Takeuchi et al.
patent: 4910479 (1990-03-01), Fuji et al.
patent: 5001693 (1991-03-01), Kakuta

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