Method and apparatus for improving baseline recovery of an MR he

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit

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360 51, 360 65, 360 66, 360 67, 360113, G11B 509

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active

06038090&

ABSTRACT:
A method and apparatus for improving baseline recovery of an MR head using a programmable AC coupling pole. The location of the pole may be adjusted to achieve the fastest recovery from a baseline shift without degrading the normal channel performance. Further, the pole may be moved during the data recovery procedure to recover from a data read error. The programmable AC coupling pole includes a circuit path carrying digital data signals read from a recording media by a magnetic head, an amplifier coupled to the circuit path for amplifying the digital data signals, and a recovery time setting means having an programmable recovery time constant associated therewith. Once a data read error has been detected by the system, the recovery time constant may be adjusted to set a recovery time for the amplifier to provide readable data signals. In addition, a digital controller may be coupled to the recovery time setting means for adjusting the recovery time setting means to change the recovery time constants in response to disturbances to the magnetic head. The programmable AC coupling pole may be disposed at the output of the magnetic head preamplifier or it may be before the data channel amplifier.

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