Magnetic reproduction circuit having variable amplification for

Details Magnetic reproduction circuit having variable amplification for Magnetic reproduction circuit having variable amplification for

1993-12-14

1995-08-22

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

G11B 5035

Patent

active

054445787

ABSTRACT:
A magnetic reproduction circuit is which includes: a Hilbert transform filter and a delay element each adapted to receive a signal reproduced from a magnetic recording medium; a variable amplifier connected to an output terminal of at least one of the Hilbert transform filter and the delay element; an adder for adding outputs of the Hilbert transform filter and the delay element wherein the outputs are fed to the adder with or without passing through the variable amplifier for varing their amplitudes; a detector for detecting a magnetic transition point of the magnetic recording medium; and a magnetization ratio detector for finding a ratio of a magnetization of the magnetic recording medium in the moving direction to a magnetization of the magnetic recording medium in a direction perpendicular the to moving direction, wherein an amplification factor of the variable amplifier is varied using the magnetization ratio found by the magnetization detector as a parameter.

REFERENCES:
patent: 4635143 (1987-01-01), Suzuki et al.
patent: 4908722 (1990-03-01), Sonobe
patent: 5077623 (1990-12-01), McSweeney
patent: 5124850 (1992-06-01), Yuzu
patent: 5307213 (1994-04-01), Nishiyama
B. J. Langland, "Phase Equalization for Perpendicular Recording", IEEE Transactions on Magnetics, vol. MAG-18, No. 6, Nov. 1982, pp. 1247-1249.
B. J. Langland et al., "Processing of Signals from Media with Perpendicular Magnetic Anisotropy", IEEE Transactions on Magnetics, vol. MAG-16, No. 5, Sep. 1980, pp. 640-642.

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