G - Physics – 11 – B
Patent
G - Physics
11
B
340/72
G11B 20/22 (2006.01) G11B 5/012 (2006.01) G11B 5/02 (2006.01) G11B 5/40 (2006.01) G11B 20/00 (2006.01) G11B 19/04 (2006.01) G11B 33/10 (2006.01)
Patent
CA 1330832
Abstract of the Disclosure A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by a magneto-resistive (MR) transducer contacting moving a storage surface. Positive and negative envelope detectors each have their inputs connected to the channel, and provide respective outputs which are summed and contain an envelope component and a residue component. A buffer interconnects the detectors to allow both detectors to follow rapid positive excursions of the data channel signal. A nonlinear signal-adaptive filter is connected to the summed output to further reduce the residue component. The data channel signal (or preferably the output from a delay means connected to the channel) is summed with the output from the filter. The relative amplitudes of these two outputs is set such that the resulting summed output signal is free of additive disturbances.
600082
Jove Stephen A.
Klaassen Klaas B.
Van Peppen Jacobus C. L.
Hitachi Global Storage Technologies Netherlands B.v.
Saunders Raymond H.
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