Method of correcting output waveform of head and magnetic disk u

Details Method of correcting output waveform of head and magnetic disk u Method of correcting output waveform of head and magnetic disk u

1997-11-06

2000-09-19

Loomis, Paul

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 53, 360 31, G11B 509

Patent

active

061221198

ABSTRACT:
A method of correcting an output waveform of a head includes the steps of (a) obtaining a sample error value of a sample value when subjecting an analog signal output from a head to an analog-to-digital conversion, and (b) correcting a vertical asymmetry of a waveform of the analog signal when carrying out he analog-to-digital conversion by changing a corresponding relationship between the analog signal and a digital signal which is obtained by the analog-to-digital conversion based on the sample error value. The step (b) calculates a correction value with respect to the analog-to-digital conversion based on the sample error value, and changes an input range of the analog-to-digital conversion to become vertically asymmetric depending on the correction value.

REFERENCES:
patent: 5517369 (1996-05-01), Takeuchi et al.
patent: 5847891 (1998-12-01), Ohmori et al.

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