Tracking servo system for magnetic disc drive with reduced head-

Details Tracking servo system for magnetic disc drive with reduced head- Tracking servo system for magnetic disc drive with reduced head-

1996-06-12

1999-02-02

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 7809, G11B 509

Patent

active

058673423

ABSTRACT:
A state variable estimator is operative, in a change-over of a magnetic head, to determine a predicted value of a state variable of a frequency-shaped filter in a follow-up to a track after the change-over based on a current head position of thereof before the change-over, by using a set of calculated coefficients representative of an amplitude and a phase difference relative to the current head position of a sine wave to be calculated by a discrete Fourrier series, as the sine wave represents the state variable of the frequency-shaped filter when the track is followed up, so that a state variable re-setting of control system is achieved to minimize a square error integration of the predicted value and a state variable of a phase compensating filter, as the change-over is a step response of a closed loop control system.

REFERENCES:
patent: 5404252 (1995-04-01), Nagasawa et al.
Sacks et al., "Advanced Methods for Repeatable Runout Compensation", IEEE Transactions on Magnetics, vol. 31, No. 2, (1995), pp. 1031-1036.

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