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Mitigation of mr read head distortion

A read head, control device technology, applied in the direction of reading/writing signal modification, recording/reproducing/deleting method, data recording, etc.

Inactive Publication Date: 2006-12-20
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The nature of the magnetoresistive read head introduces some distortion in the readback waveform

Method used

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  • Mitigation of mr read head distortion
  • Mitigation of mr read head distortion
  • Mitigation of mr read head distortion

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Embodiment Construction

[0020] In the following description, the present invention is described in preferred embodiments by referring to the accompanying drawings, wherein like reference numerals indicate the same or similar elements. While the invention has been described as the best mode for achieving the objects of the invention, those skilled in the art will recognize that changes may be made by these teachings without departing from the spirit and scope of the invention.

[0021] refer to figure 1 , shows a tape drive 10 in which aspects of the present invention may be implemented. The tape drive provides a means for reading and writing information about the magnetic tape 14 of the tape cartridge 11 .

[0022] Magnetic tape cartridges provide a way to store data on magnetic tape to be saved and retrieved at a later time. Additionally, tape cartridges can be swapped between tape drives so that a tape written on one tape drive can be read by another tape drive.

[0023] As will be appreciated b...

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PUM

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Abstract

Mitigation of distortion of read signals from magneto-resistive read head(s) are provided in various embodiments of the present invention. In one embodiment, the read signals provided to a read channel having an analog to digital converter and digital equalizer. Digital peak measurement apparatus is configured to sense the output of the digital equalizer, and provide average positive peak values and average negative peak values of the output. Control apparatus is configured to respond to the peak values, to iteratively determine asymmetry of the peak values and estimate the cancellation slope of the asymmetry and cancellation term relationship; from the measured asymmetry and estimated cancellation slope, to iteratively estimate the convergence cancellation term; and to feed back the convergence cancellation term to modify the digital read signals for the input of the digital equalizer to iteratively converge the asymmetry to substantially zero.

Description

[0001] Cross References to Related Applications [0002] Co-assigned co-pending US Patent Application No. 10 / 966,531, as it shows the use of a lookup module for reducing signal asymmetry. technical field [0003] The present invention relates to signal processing of a read signal of a magnetoresistive read head, and more particularly to reducing distortion of a read signal of a magnetoresistive read head. Background technique [0004] In data storage devices using magnetic media, such as magnetic tape or magnetic disk media, data recorded on the magnetic media in the form of flux reversals is typically read by a magnetoresistive read head providing an analog read signal. The read signal is typically provided to a read channel having at least one preamplifier for amplifying the signal, and at least one analog-to-digital converter for converting the analog read signal to a digital signal. The resulting signal is a digital sample set of the readback waveform. All subsequent p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/035G11B5/00
CPCG11B5/00813G11B2005/0013G11B20/10009G11B5/09
Inventor J·F·巴扬E·S·盖尔D·L·斯万松
Owner IBM CORP