Offset compensation in local-probe data storage devices

Details Offset compensation in local-probe data storage devices Offset compensation in local-probe data storage devices

2007-02-06

2007-02-06

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Converter compensation

C365S189080, C365S206000

Reexamination Certificate

active

11083405

ABSTRACT:
Methods and apparatus for compensating offsets in a read signal generated by a sensor associated with a probe of a local-probe data storage device during read-scanning by the probe of bit-positions on a storage surface. An apparatus comprises a generator for generating an offset compensation signal, and a subtraction stage for producing an output signal dependent on the difference between the offset compensation signal and the sensor read signal at each bit-position. In some embodiments, an offset signal generator generates an offset compensation signal dependent upon a predetermined measurement of the sensor read signal. In another aspect the offset signal generator low-pass filters the sensor read signal during read scanning to generate the offset compensation signal. Particular embodiments also include a secondary offset compensation stage for applying additional offset compensation techniques to the output signal from the subtraction stage.

REFERENCES:
patent: 5583706 (1996-12-01), Dudley et al.
patent: 6005431 (1999-12-01), Mehr et al.
patent: 2005/0066107 (2005-03-01), Bachtold et al.
patent: 2005/0162932 (2005-07-01), Ricotti et al.
patent: 2005/0259366 (2005-11-01), Champion et al.
patent: WO 03021592 (2003-03-01), None

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