Non-repeatable run out compensating apparatus and method and...

Details Non-repeatable run out compensating apparatus and method and... Non-repeatable run out compensating apparatus and method and...

2008-01-01

2008-01-01

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040, C360S077020

Reexamination Certificate

active

07315433

ABSTRACT:
An apparatus and method are provided for quickly and finely compensating for non-repeatable run out (NPRO) of a disc drive. The NPRO compensation control apparatus in a run out compensation apparatus of a system includes: a frequency estimator directly estimating a trigonometric function value of an NRRO frequency from a predetermined signal responding to the system using a correlation between a filter coefficient of a notch filter and a notch frequency; and an NRRO compensator canceling NRRO of the system using the trigonometric function value of the NRRO frequency estimated by the frequency estimator.

REFERENCES:
patent: 6618219 (2003-09-01), Ho
patent: 6628472 (2003-09-01), Ho
patent: 6636376 (2003-10-01), Ho
patent: 6768607 (2004-07-01), Ottesen et al.
patent: 6771144 (2004-08-01), Takamine
patent: 6922596 (2005-07-01), Erickson et al.
patent: 7016142 (2006-03-01), Jung et al.

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