Automatic correction of position demodulator offsets

Details Automatic correction of position demodulator offsets Automatic correction of position demodulator offsets

1990-03-30

1993-09-21

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7804, 369 32, G11B 554, G11B 2102

Patent

active

052473988

ABSTRACT:
A disk drive system wherein the radial position of a sensing head is servoed using signals derived from the sensing of servo signals recorded in circular tracks on a disk surface and disposed in circumferentially spaced sets thereof, each set comprising radially aligned signals in a succession of tracks, where the derived signals vary cyclically as a function of the radio position of the head. The DC offsets of the derived signals relative to a reference level are removed by causing a constant velocity radial displacement of the head and, for each of the derived signals, measuring the durations of the positive and negative half-cycles of the derived signal relative to the reference level and adding to the derived signal an offset voltage sufficient to equalize the durations.

REFERENCES:
patent: 4006394 (1977-02-01), Cuda et al.

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