Apparatus and method for correcting a read signal in a disk driv

Details Apparatus and method for correcting a read signal in a disk driv Apparatus and method for correcting a read signal in a disk driv

1995-10-27

1998-09-15

Young, W. R.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 51, G11B 5035

Patent

active

058088229

ABSTRACT:
In a disk drive system, a circuit reduces the deterioration of the S/N ratio and corrects the position of a peak in a read signal to an accurate position. In one embodiment, a circuit senses the threshold levels corresponding to the magnitudes of three consecutive peaks of a read signal. A comparator obtains the direction of shift of the centrally positioned peak with respect to a reference position from the relationship of the magnitudes of the three consecutive peaks. The comparator outputs a pulse representing the direction of shift to a FIFO buffer. A delay circuit outputs a plurality of pulses. The pulses are shifted by an amount corresponding to a threshold level. A multiplexer selects a pulse to output from the delay circuit based on the direction of shift that was output from the FIFO buffer and based on the difference detected by an amplitude detection circuit. In an alternative embodiment, the correction circuit is implemented using a microprocessor.

REFERENCES:
patent: 4306194 (1981-12-01), Chapman
patent: 4306257 (1981-12-01), Harman
patent: 4979189 (1990-12-01), Wile
patent: 5105316 (1992-04-01), Cronch et al.
patent: 5170359 (1992-12-01), Sax et al.
patent: 5276666 (1994-01-01), Gunther et al.
patent: 5335118 (1994-08-01), Meyer
patent: 5414722 (1995-05-01), Tollum

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