Low frequency signal baseline shift compensation in a disc drive

Details Low frequency signal baseline shift compensation in a disc drive Low frequency signal baseline shift compensation in a disc drive

1997-10-30

2000-07-18

Faber, Alan T.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 25, 360 65, 360 46, 360 7708, 360 7814, 360 75, G11B 509

Patent

active

060915609

ABSTRACT:
An apparatus and method for removing baseline shift in low frequency readback signals of a disc drive, such signals characterized by peaks separated by baseline portions. The disc drive comprises a head controllably positionable adjacent tracks on a rotatable disc, a servo circuit which controls the position of the head in response to the readback signals and an adjustable filter operably connected to and serially disposed between the head and the servo circuit. When baseline shift is detected in the baseline portions of the readback signals at a predetermined margin threshold, the response characteristics of the adjustable filter are adjusted to remove the detected baseline shift from the readback signals.

REFERENCES:
patent: 5684651 (1997-11-01), Yaegashi et al.
patent: 5790335 (1998-08-01), Sugawara et al.

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