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    • 5. 发明授权
    • Mitigation of MR read head distortion
    • 减少MR读头失真
    • US07230783B2
    • 2007-06-12
    • US11154123
    • 2005-06-16
    • Josephine Faith BayangErnest Stewart GaleDavid Lee Swanson
    • Josephine Faith BayangErnest Stewart GaleDavid Lee Swanson
    • G11B5/09G11B5/035
    • G11B5/09G11B5/00813G11B20/10009G11B2005/0013
    • 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.
    • 在本发明的各种实施例中提供了从磁阻读取头读取信号的失真的缓解。 在一个实施例中,提供给具有模数转换器和数字均衡器的读通道的读信号。 数字峰值测量装置被配置为感测数字均衡器的输出,并且提供输出的平均正峰值和平均负峰值。 控制装置被配置为响应峰值,迭代地确定峰值的不对称性并且估计不对称和消除项关系的抵消斜率; 从测量的不对称和估计的抵消斜率,迭代估计收敛消除项; 并且反馈收敛消除项以修改用于数字均衡器的输入的数字读取信号,以将不对称性迭代收敛到基本为零。