Track following code and track following system

Details Track following code and track following system Track following code and track following system

1984-09-10

1985-11-19

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 556

Patent

active

045546002

ABSTRACT:
A system for following a track on a moving data storage member having stored thereon a track following code. The code includes, on one side of the track centerline, a first area of magnetic flux of one polarity followed by a second area of magnetic flux of opposite polarity, and on the other side of the track centerline, a third area of magnetic flux of the opposite polarity followed by a fourth area of magnetic flux of the one polarity, the second and fourth areas commencing at substantially the same positions on the storage member. A transducer, positioned adjacent to the moving data storage member, senses the changes in magnetic flux as the code passes by and provides at its output one or more timing signals in response to the first and third areas passing and a residual signal in response to the second and third areas passing by. The residual signal is formed by the transducer measuring and summing the changes in flux of the second and fourth areas, the measured changes in flux related to the direction and distance of displacement of the transducer from a position where it is centered with respect to the track centerline. A decoder, receiving the output of the transducer, utilizes the timing signals to separate out the residual signal from the signals provided by the transducer.

REFERENCES:
patent: 4101942 (1978-07-01), Jacques
IBM Technical Disclosure Bulletin, vol. 17, No. 2, Jul. 1974, pp. 456-457, Magnetic Disk Servo Control Device, Zimmerman et al.
IBM Technical Disclosure Bulletin, vol. 18, No. 8, Jan. 1976, pp. 2656-2657, Null Servo Pattern, Betts.

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