Magnetic disk apparatus and read waveform equalizing method usin

Details Magnetic disk apparatus and read waveform equalizing method usin Magnetic disk apparatus and read waveform equalizing method usin

1997-11-20

1999-03-23

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 53, 375230, 375231, G11B 5035, G11B 509

Patent

active

058868445

ABSTRACT:
Prior to starting the use of an apparatus, an isolated waveform writing section writes a predetermined isolated waveform into a predetermined region of each track of a disk medium by designating a head number and a track number. The isolated waveform is subsequently read out by an isolated waveform reading section and is quantized by an analog/digital converter. Tap coefficients of a transversal filter are calculated by a tap coefficient calculating section. The tap coefficients calculated by the tap coefficient calculating section are stored in a memory on the basis of the track number and head number used when the isolated waveform is written. Upon reproduction during the use of the apparatus, a tap coefficient setting section reads out the corresponding tap coefficients from the memory on the basis of the track number and head number designated by a seek command and sets to the transversal filter.

REFERENCES:
patent: 4707841 (1987-11-01), Yen et al.
patent: 5008761 (1991-04-01), Nishiyama et al.
patent: 5341249 (1994-08-01), Abbott et al.
patent: 5353310 (1994-10-01), Russell et al.
patent: 5369667 (1994-11-01), Hara
patent: 5467232 (1995-11-01), Ouchi et al.
patent: 5590205 (1996-12-01), Popovich

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