Title:
MAGNETIC DISK DEVICE AND READ-OUT WAVEFORM EQUALIZING METHOD
Document Type and Number:
Japanese Patent JP3513228
Kind Code:
B2
Abstract:
PURPOSE: To surely remove interference between the codes of the read-out waveform from a disk and to equalize the waveform being optimal for Viterbi decoding.
CONSTITUTION: A prescribed isolated waveform is written in the predetermined area of every track of a disk medium 70 by the designation of a head number and a track number prior to the starting of use of a device in an isolated waveform writing part 100, next, the isolated waveform is read out by means of an isolated waveform reading part 102, quantized in an analog/digital converter 60 and the tap coefficient of a transversal filter 62 is calculated in a tap coefficient calculating part 104. The tap coefficient calculated in the tap coefficient calculating part 104 is stored in a memory 106 based on the track number and the head number used for writing the isolated waveform. At the time of reproduction during the use of the device, a tap coefficient setting part 110 reads out the corresponding tap coefficient from the memory 106 based on the track number and the head number designated by a seek command and set it in the transversal filter 62.
Inventors:
Shimizu, Shoichi
Application Number:
JP23493394A
Publication Date:
March 31, 2004
Filing Date:
September 29, 1994
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
G11B5/09; G11B5/012; G11B5/035; G11B20/10; G11B20/18; H03M13/41; H04L1/00; H04L25/03; (IPC1-7): G11B5/09
Attorney, Agent or Firm:
竹内 進 （外１名）
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