Dynamic magnetic information storage or retrieval – Modulating or demodulating
Patent
1998-02-04
2000-09-19
Kim, W. Chris
Dynamic magnetic information storage or retrieval
Modulating or demodulating
360 46, 360 7702, G11B 502, G11B 509, G11B 5596
Patent
active
061221171
ABSTRACT:
Disclosed is a method of demodulating a position signal in a magnetic disk device for reading servo burst signals, which have been recorded in a servo area of a magnetic disk, by a head, and outputting a position signal, which indicates a deviation from a reference position on a track, using the servo burst signals that have been read. The position signal demodulating method includes (1) recording first and second servo burst signals in the servo area alternately in the radial direction, (2) digitally sampling the first and second servo burst signals, which have been read by the head, at a frequency two or more times greater than a servo burst signal frequency, (3) calculating area information of each of first and second servo burst signal waveforms by summing absolute values of the digitally sampled values in regard to each of the first and second servo burst signals, and (4) outputting, as a position signal, the difference between the area information of the first servo burst signal waveform and the area information of the second servo burst signal waveform.
REFERENCES:
patent: 5343340 (1994-08-01), Boutaghou et al.
Fujitsu Limited
Kim W. Chris
LandOfFree
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