AGC circuit and recording and reproducing apparatus using AGC ci

Details AGC circuit and recording and reproducing apparatus using AGC ci AGC circuit and recording and reproducing apparatus using AGC ci

1994-02-15

1995-09-05

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

348646, G11B 5035

Patent

active

054484243

ABSTRACT:
An AGC circuit is provided with a variable gain amplifier which changes an amplification gain of an input signal in accordance with an instruction; an extraction unit for extracting a value of an output of the variable gain amplifier at a predetermined interval; and a variable gain control unit for instructing the amplification gain of the variable gain amplifier in a manner such that the amplitude of the input signal is equal to a predetermined amplitude on the basis of the value extracted by the extraction unit. The variable gain control unit is provided with an error signal output device for squaring the value extracted by the extraction unit and for generating an error signal to instruct the amplification gain of the variable gain amplifier in a manner such that the amplitude of the input signal is equal to a predetermined amplitude on the basis of the square value and a square value just before it; and an integrating device for integrating the error signal from the error signal output device and for instructing the amplification gain of the variable gain amplifier.

REFERENCES:
patent: 4398261 (1983-08-01), Saint-Ajant et al.
patent: 4447826 (1984-05-01), Lewis, Jr. et al.
patent: 4466015 (1984-08-01), Hargo et al.
patent: 4482916 (1984-11-01), Acampara
patent: 4673970 (1987-06-01), Matsumato et al.
patent: 4875045 (1989-10-01), Lynch et al.
patent: 5157493 (1992-10-01), Hanover et al.
patent: 5170166 (1992-12-01), Tanaka et al.
patent: 5187481 (1993-02-01), Hiller

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