Rangeless servo notch optimization

Details Rangeless servo notch optimization Rangeless servo notch optimization

2006-01-17

2006-01-17

Faber, Alan T. (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S065000, C360S077080, C360S078090

Reexamination Certificate

active

06987629

ABSTRACT:
A method for placing a predetermined number of notch filters in a disc drive servo control system to attenuate noise frequencies, in order of decreasing resonance magnitudes, is disclosed. The method involves calculating an open loop response for a response spectrum of the drive, calculating a notch filter for any noise frequency that exceeds a threshold, mathematically applying the notch filter into the servo control system, recalculating the open loop response and applying another filter for a noise frequency that exceeds the threshold and repeating until no noise frequencies exceed the gain threshold; selecting another frequency range and repeating the same process until a predetermined number of notch filters has been placed in the servo control system.

REFERENCES:
patent: 5325247 (1994-06-01), Ehrlich et al.
patent: 5638230 (1997-06-01), Kadlec
patent: 6219196 (2001-04-01), Semba et al.
patent: 6246536 (2001-06-01), Galloway
patent: 6377418 (2002-04-01), Kagami et al.
patent: 6741914 (2004-05-01), Tze Ming Pang
patent: 2003/0048569 (2003-03-01), Galloway et al.
U.S. patent application Ser. No. 10/056,337, Galloway et al., filed Jan. 24, 2002.

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