Up-sampled filtering for servo demodulation

Details Up-sampled filtering for servo demodulation Up-sampled filtering for servo demodulation

2007-01-02

2007-01-02

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077080, C360S078040, C360S039000, C360S032000

Reexamination Certificate

active

10682138

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.

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patent: 6324030 (2001-11-01), Cheung et al.
patent: 6738205 (2004-05-01), Moran et al.

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