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AssigneeInternational Business Machines Corporation
InventorsArno Matla, Volker Zimmermann
Estimating the term…
For the servo track control of magnetic heads over magnetic tracks, in addition to the main servo position signals arranged in offset fashion to the middle of the track, auxiliary servo position signals are provided symmetrically on each side of the middle of the track. These auxiliary servo position signals are offset along the track length relative to each other and are smaller than half the track width. In the determination of the position error signal, they serve to indicate the tilting of the magnetic head relative to the recording track in that they are unequal. If the magnetic head deviates greatly from the middle of the track, these auxiliary servo position signals can be added to the main servo position signals to obtain a stronger position error signal. For determining and compensating uniform disturbance variables, the momentary values of a control signal are measured and a mean value is formed thereof which, at predetermined intervals, is added to a preceding mean value, stored, and entered as an additional control signal to the control path.
Servo track following control for controlling and maintaining the track position of magnetic heads executing a movement relative to a magnetic record carrier, the servo track containing main servo position signals (A, B) whose combined width is wider than the track width (W), said servo position signals being recorded in offset fashion on said magnetic record carrier on both sides of the middle of a recording track, the value of the servo position signals read by the magnetic head being detected by the control, and a position error signal being generated by checking whether the difference of the two servo position signals (A, B) equals zero,
A method of encoding main and auxiliary servo position signals (A, B, a, b) for a track following servo, the track to be followed having a predetermined width W, comprising the steps of:
Dependencies are inferred from the claim text.