Asymmetry correction in read signal
US7511910B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 2005 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Mar 31, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2516
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Systems and techniques relating to interpreting signals on a channel having an asymmetrical signal amplitude response. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes an asymmetry correction circuit configured to receive an analog signal and to compensate for asymmetry in the received analog signal, a signal equalizer configured to receive an input signal responsive to an output of the asymmetry correction circuit and to generate an equalized signal, a discrete time sequence detector operable to examine the equalized signal, and a control circuit operable to provide a coefficient adjustment to the asymmetry correction circuit to affect the asymmetry compensation based on an estimate of nonlinearity derived from the equalized signal and multiple output values of the discrete time sequence detector, the multiple output values being values corresponding to at least two different discrete times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.