Method and system for removing signal defects in MR head...

Details Method and system for removing signal defects in MR head... Method and system for removing signal defects in MR head...

2006-05-26

2009-06-09

Feild, Joseph H (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

C360S067000

Reexamination Certificate

active

07545594

ABSTRACT:
The disclosure describes a data storage system that includes a signal defect correction system for removing signal defects in magnetoresistive head playback signals. The signal defect correction system utilizes a matched finite impulse response (FIR) filter and digital signal processing algorithms. The matched FIR filter is designed with an impulse response that is the time reversed, complex conjugate of a signal defect model. The signal defect model is generated from a number of sample playback signals. The matched FIR filter is applied to the playback signal and digital signal processing techniques are applied to the filter response to detect a signal defect in the playback signal and estimate the amplitude and location of the signal defect. The signal defect model is retrieved from memory and applied to the playback signal using the amplitude and location estimates to substantially remove the signal defect from the playback signal.

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“Electronic Abatement of Thermal Interference in (G)MR Head Output Signals,” Klaassen et al.;IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 2611-2616.

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