Optical information recording and regenerating apparatus which r

Details Optical information recording and regenerating apparatus which r Optical information recording and regenerating apparatus which r

1995-04-28

1997-02-25

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 47, 369 4436, G11B 700

Patent

active

056065442

ABSTRACT:
An optical information recording and regenerating apparatus for optically recording and regenerating information to and from a medium having a regenerating system which includes an AGC circuit consisting of a gain-variable amplifier for controlling the amplitude of a regenerated signal, which is obtained when regenerating information, to a predetermined value; a differential circuit for differentiating an output signal of the AGC circuit; and a peak detecting circuit for detecting the peak value of an output of the differential circuit. The AGC circuit controls gain in accordance with the output of the peak detecting circuit so that the peak value of a differential signal of a regenerated signal in a preformat area, wherein information has been embossed in a medium beforehand, becomes constant.

REFERENCES:
patent: 5311493 (1994-05-01), Fuji
patent: 5355356 (1994-10-01), Johann et al.

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