Up-sampled filtering for servo demodulation
US7158333B1 · kind B1 · utility
17Cited by
7References
105Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 9, 2003 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Dec 26, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/556
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus, method, and system for providing a fine adjustment for transducing head positioning in a hard disk drive (HDD). The apparatus, method, and system include reading a positioning error field wherein the resulting signal is a substantially sinusoidal position error signal (PES), filtering the PES to remove low frequencies and attenuate high frequencies, sample the filtered PES at a multiple of the channel frequency, filter the higher frequency harmonics, down sample the PES, and provide a signal proportional to the amplitude of the down sampled PES. This signal is the reference signal to the head positioning servo.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.