Method and circuitry to suppress additive disturbances in data channels
US5057785A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Jan 23, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and circuitry for suppressing additive transient disturbances in an analog differential input signal, such disturbances being due, for example, to thermal asperity transients caused by an MR transducer contacting a moving storage surface. The input data signal is algebraically summed with a corrective feedback signal for providing as output signal. The output signal is fed back to a circuit including an envelope detector and differentiator and converted into another signal that is the derivative of an amplitude envelope corresponding to the output signal. Nonlinear signal-adaptive filter means converts said other signal into the corrective feedback signal, which substantially replicates the additive transient disturbance and is subtracted from the data input signal to render the output signal substantially free of the transient disturbance. The input, output and corrective signals are preferably differential signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.