Head position demodulating method and disk apparatus

Details Head position demodulating method and disk apparatus Head position demodulating method and disk apparatus

2005-10-18

2005-10-18

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077040, C360S029000

Reexamination Certificate

active

06956712

ABSTRACT:
A head position is demodulated by two-phase servo signals of PosN and PosQ from output of the head, so as to acquire a more accurate demodulated position. Saturation of PosN and PosQ is judged from the ratio of each absolute value of PosN and PosQ, and a different demodulating method is used for a saturated area and for an unsaturated area, and a demodulating formula is constructed so that the edge of each demodulating area matches with the edge of the adjacent demodulating area. Also saturated/unsaturated is judged by comparing the absolute value of PosN and the absolute value of PosQ, and determining whether the ratio thereof is greater or small than a predetermined saturation coefficient r.

REFERENCES:
patent: 5822144 (1998-10-01), Takahashi
patent: 5867341 (1999-02-01), Volz et al.
patent: 6091567 (2000-07-01), Cooper et al.
patent: 6369974 (2002-04-01), Asgari et al.
patent: 785 542 (1997-07-01), None
patent: 8-195044 (1996-07-01), None

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