Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Reexamination Certificate
2002-06-24
2008-12-16
Feild, Joseph H (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
C380S031000, C380S044000
Reexamination Certificate
active
07466507
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.
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U.S. Appl. No. 10/056,337, Galloway et al., filed Jan. 24, 2002.
Andress Jeffrey Don
Berry Charles Randall
Fulkerson Christopher Ryan
Feild Joseph H
Negrón Daniell L
Seagate Technology LLC
Shumaker & Sieffert P.A.
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