Equalizer used for magnetic storage device

Details Equalizer used for magnetic storage device Equalizer used for magnetic storage device

1984-12-21

1987-02-17

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

333 28R, G11B 502, H04B 314, H03H 1106

Patent

active

046444246

ABSTRACT:
An equalizer equalizes a reproduced waveform reproduced by a thin film magnetic head by reproducing information recorded magnetically on a medium. In the equalizer, the reproduced waveform is delayed to a position of an undershot portion, and is attenuated to an amplitude corresponding to a magnitude of the undershot portion, and the resultant waveform is superposed on the reproduced waveform, to thereby eliminate the undershot portion. Furthermore, by superposing a waveform obtained by inverting the reproduced waveform and amplifying or attenuating the inverted waveform, on the reproduced waveform at a half power position thereof, the width is narrowed.

REFERENCES:
patent: 3927420 (1975-12-01), Hayashi et al.
patent: 4266204 (1981-05-01), Jacoby
patent: 4456893 (1984-06-01), Otani
patent: 4491808 (1985-01-01), Saito
IBM-TDB C. E. Schlaepfer vol. 16, No. 8, 1/74 Pulse Filter with Pulse Asymmetry Correction.
IBM-TDB R. L. Comstock and C. C. Lin vol. 20, No. 1, Adaptive Equalizer for Read Channel, 6/77.

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