Dynamically adapting a magnetic tape read channel equalizer

Details Dynamically adapting a magnetic tape read channel equalizer Dynamically adapting a magnetic tape read channel equalizer

2007-09-18

2007-09-18

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

C360S077120, C360S067000, C360S068000, C360S051000, C360S039000

Reexamination Certificate

active

11003283

ABSTRACT:
A read channel equalizer of a magnetic tape drive which equalizes digitally sampled magnetic signals detected by a read head is dynamically adapted. A detector of equalizer dynamic adaptation logic compares equalizer output signals to desired values that are based on the decoding scheme (such as +2, 0 and −2 for PR4) to sense equalizer output signals that are offset from at least one desired value, and signals the fact of each offset and its polarity as amplitude independent error signals. The signaled sensed amplitude independent error signals are fed back to adjustable taps of the equalizer. The simplified error signals thus avoid complex calculations of waveform errors, such as least mean square calculations. The error signals may be weighted and may be adjusted to align synchronously provided error signals with asynchronous taps of the equalizer.

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Shahid U. H. Qureshi, Adaptive Equalization, Proceedings of the IEEE, vol. 73, No. 9, Sep. 1985, pp. 1349-1387.

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