Method of and apparatus for controlling the gain of circuitry re

Details Method of and apparatus for controlling the gain of circuitry re Method of and apparatus for controlling the gain of circuitry re

1980-12-02

1983-07-05

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 39, 360 67, G11B 502, G11B 509, G11B 2110

Patent

active

043921647

ABSTRACT:
The amplitude of signals read by a head from a magnetic disc is controlled. The disc includes plural concentric tracks, each including data and reference zones. Each reference zone includes plural abutting tracks having a first axis. Each data zone includes a pair of abutting tracks having a second axis, with the first axis being displaced from the second axis by approximately one-half the radial width of a track. The head is desirably positioned so it is centered on a data zone and straddles a pair of reference zones. Each reference zone includes plural cells having magnetic flux transitions which cause the head to derive a pair of opposite polarity pulses as the cells move longitudinally relative to the head. The pulse amplitude is a function of (a) the distance separating the head from the disc, (b) the head radial position, and (c) the presence or absence of faults on the disc. The amplitude is controlled by deriving a first signal indicative of the deviation from a reference value of the absolute value of the derivative of the pulses. The first signal controls the gain of a variable gain amplifier while the data zone immediately following the reference zone moves longitudinally relative to the head.

REFERENCES:
patent: 3725885 (1973-04-01), Andresen
patent: 4074325 (1978-02-01), Sakai et al.
patent: 4151571 (1979-04-01), Cardot et al.
patent: 4298898 (1981-11-01), Cardot
patent: 4326226 (1982-04-01), Touchton et al.
IBM Tech. Disc. Bull., D. H. Martin, Data-Track-Following Servo System, vol. 14, No. 8, Jan. 1977, pp. 3228-3229.

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