Phase-compensated servo pattern and position error-sensing detec

Details Phase-compensated servo pattern and position error-sensing detec Phase-compensated servo pattern and position error-sensing detec

1994-10-04

1997-03-25

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, G11B 5596

Patent

active

056150652

ABSTRACT:
A demodulator for a servo control system receives a servo signal that is produced from reading a servo pattern that comprises a repeating sequence of trigonometric-compensated, phase-encoded magnetic flux transitions that extend continuously across the width of a servo track and includes a burst cosine phase detector that samples the amplitude of the servo signal at regular intervals and produces burst sample data, from which the demodulator produces a position error signal that is a substantially linear function of the servo head position relative to the servo track width. Because a plurality of amplitude samples is taken from each cycle of the servo signal, an increased signal-to-noise ratio can be obtained for the servo signal. The superior signal characteristics permit smaller and less complex demodulator elements to be used, thereby reducing the overall servo control system complexity. The burst cosine phase detector multiplies the servo signal samples with a predetermined set of reference coefficients to produce a linear phase difference that indicates the servo head radial position.

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