Magnetic disk device

Details Magnetic disk device Magnetic disk device

1993-05-17

1995-03-28

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 48, G11B 509

Patent

active

054022762

ABSTRACT:
A magnetic disk device using a pattern in which a plurality of pulse trains functioning as a demodulation start synchronization mark, having one-half a frequency of a clock synchronization PLOSYNC but having mutually different pulse numbers, are dispersedly arranged in pulse trains having the same frequency as that of the clock synchronization PLOSYNC, and also using, as a unit for detecting the demodulation start synchronization mark, a unit which confirms coincidence of the pattern in a time unit of one period of the pulse trains of the clock synchronization PLOSYNC and recognizes the demodulation start synchronization mark by complete coincidence of the demodulation start synchronization mark with the pattern or by coincidence of at least a predetermined number of the demodulation start synchronization marks with the pattern.

REFERENCES:
patent: 4748623 (1988-05-01), Fujimoto
patent: 4805046 (1989-02-01), Kuroki et al.
patent: 4858035 (1989-08-01), Hikawa
patent: 4862443 (1989-08-01), Tsuji et al.

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