Track centering servo pulse noise filter

Details Track centering servo pulse noise filter Track centering servo pulse noise filter

1980-09-26

1983-04-12

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2110

Patent

active

043800343

ABSTRACT:
A track centering servo pulse noise filter is provided. Prerecorded pulses on a disk track's even and odd half tracks are sensed by the disk's read head, preamplified, DC biased, peak detected, and stored on a FIFO basis into a noise filter comprising two sets of N analog sample and hold cells, one set for the even pulses and one set for the odd pulses. The output of each even-pulse sample and hold cell is input to a summing junction to form an average of the last N pulses. The same is done with the outputs of the odd-pulse sample and hold cells. The two summing junctions are then input to a differential amplifier to form a position error signal to the disk head track centering servo system for keeping the head centered on the track.

REFERENCES:
patent: 3893180 (1975-07-01), Braun et al.
patent: 4092683 (1978-05-01), Andrews, Jr. et al.
patent: 4130844 (1978-12-01), Klinger
patent: 4148082 (1979-04-01), Okada et al.
patent: 4149199 (1979-04-01), Chick et al.
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4204234 (1980-05-01), Noble
patent: 4230809 (1980-12-01), Fujiki et al.

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