Apparatus and method for determining read head position

Details Apparatus and method for determining read head position Apparatus and method for determining read head position

1981-08-10

1984-02-14

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 500, G11B 2110

Patent

active

044320264

ABSTRACT:
A system is described for determining the position of a magnetic read head relative to the center of a selected data track on a magnetic recording medium moving with respect to the read head. Tracking signals of equal frequency, but out of phase a predetermined fixed amount, are recorded on adjacent data tracks. The tracking signal frequency is selected to be a long enough wavelength such that a single read head positioned over a selected data track also detects the tracking signal recorded on adjacent data tracks. A phase comparator compares the phase of the tracking signal detected by the read head with respect to the phase of a reference signal of equal frequency, and a resultant signal is generated which is indicative of any deviation of the read head from the center of the selected track.

REFERENCES:
patent: 3263031 (1966-07-01), Welsh
patent: 4110799 (1978-08-01), Bergmans et al.
patent: 4213148 (1980-07-01), Clemens
Dennis A. Lindholm, "Spacing Losses in Finite Track Width Reproducing Systems", IEEE, vol. Mag-14, No. 2, Mar. 1978.

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