Non-repeatable run out compensating apparatus and method and disc drive using the same
US7315433B2 · kind B2 · utility
5Cited by
7References
19Claims
0Family size
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Key dates
| Filing date | Nov 8, 2005 |
| Grant date | Jan 1, 2008 |
| Priority date | — |
| Expiry date | Nov 8, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.