Reproducing signal amplifier and central value signal generator

Amplifiers – With plural amplifier channels – D.c. and a.c. amplifier channels

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Details

360 68, H03F 368, G11B 502

Patent

active

057511918

ABSTRACT:
A magnetic recording device includes a magnetic disk drive for recording desired information as a magnetic signal and a reproducing signal amplifier for amplifying a small electric signal obtained by converting the magnetic signal. The reproducing signal amplifier includes an amplifier for amplifying a small electric signal supplied through an input terminal into an amplified signal having an appropriate amplitude, a central value detection circuit for detecting a central value of the AC component of the amplified signal output by the amplifier and outputting a central value signal consisting of the DC component of the amplified signal, and a subtracter for obtaining a difference between the amplified signal and the central value signal and outputting a reproducing signal.

REFERENCES:
patent: 5051847 (1991-09-01), Philipps
patent: 5386109 (1995-01-01), Ikeuchi et al.

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