Method and circuitry to suppress additive disturbances in data c

Details Method and circuitry to suppress additive disturbances in data c Method and circuitry to suppress additive disturbances in data c

1988-08-01

1990-04-03

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328162, 307520, 307555, 307350, 455296, 455303, 333 14, H03K 500, H04B 110

Patent

active

049143980

ABSTRACT:
A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by an 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.

REFERENCES:
patent: 3473131 (1969-10-01), Perkins
patent: 3566281 (1971-02-01), Baumann
patent: 3588705 (1971-06-01), Paine
patent: 3903485 (1975-09-01), Dolby
patent: 4141494 (1979-02-01), Fisher
patent: 4163909 (1979-08-01), Harr
patent: 4356389 (1982-10-01), Quirey
patent: 4433256 (1984-02-01), Dolikian
patent: 4698597 (1987-10-01), Merli et al.
patent: 4739518 (1988-04-01), Bickley et al.
patent: 4780623 (1988-10-01), Yagi

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