Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-10-27
1997-12-02
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 48, 369 32, G11B 700
Patent
active
056943865
ABSTRACT:
An information reproducing apparatus which includes: pickup section for converting information recorded in a recording medium into an electrical signal; preprocessing section for amplifying a signal output from the pickup section; automatic gain control circuit for receiving a signal output from the preprocessing section as an input signal and for eliminating an amplitude change component other than the information from the input signal; and digital signal reproducing section for reproducing a digital signal corresponding to a signal output from the automatic gain control circuit, the automatic gain control circuit including: amplifier section for amplifying the input signal so as to be output as an output signal, and for receiving a control signal for controlling a gain; and control section for controlling the gain of the amplifier section, the control section including: amplitude detector for detecting an amplitude of the output signal; control signal generator for generating a control signal corresponding to the amplitude of the output signal; memory section for storing the control signal; and interpolation section for detecting an error signal caused by an input signal in an impulse form from the control signal and replacing the error signal with an interpolation signal.
REFERENCES:
patent: 4970594 (1990-11-01), Kitaura et al.
patent: 5012461 (1991-04-01), Yoshida et al.
patent: 5212562 (1993-05-01), Ogura
patent: 5361247 (1994-11-01), Fuji et al.
Fuji Hiroshi
Hirajima Hiroshige
Dinh Tan
Epps Georgia Y.
Sharp Kabushiki Kaisha
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