Method and apparatus for providing multi-point position...

Details Method and apparatus for providing multi-point position... Method and apparatus for providing multi-point position...

2006-11-14

2006-11-14

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000, C360S077040, C360S077070

Reexamination Certificate

active

07136253

ABSTRACT:
The present invention is directed to a method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information. In one embodiment, a disk surface has spiral servo information written thereon. A read head generates a read signal envelope when reading the spiral servo information. A read signal envelope is detected within an integration window and integration values are accumulated over the integration window. The accumulated integration values are multiplied by a first number associated with a first integrator value and a second number associated with a second integrator value. A first position error signal associated with the first integrator value is determined, and a second position error signal associated with the second integrator value is also determined. A final position error signal is determined using the first position error signal and the second position error signal.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 6144517 (2000-11-01), Watanabe et al.
patent: 6704156 (2004-03-01), Baker et al.

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