Communication channel with adaptive analog transversal equalizer
US5592340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1994 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Sep 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03611
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An adaptive, analog filter system of a PRML [PARTIAL RESPONSE MAXIMUM LIKELIHOOD ] read channel of a disc drive comprising an adaptive, analog transversal equator connected in series with an adaptive, analog prefilter. The prefilter is comprised of a plurality of serially connected, adaptive, analog filter stages having variable transfer functions determined by adaptive parameter signals received by the filter stages. The transversal equalizer is comprised of a delay circuit, comprised of a plurality of serially connected, adaptive, analog sixth order low pass filters, that is tapped to either side of each low pass filter, a plurality of analog multipliers that receive signals at the tap locations of the delay circuit, and a summing circuit that receives the outputs of the multipliers. The transfer functions of the sixth order low pass filters are continuously variable in relation to adaptive parameter signals received by the low pass filters and the gains of the multipliers are continuously variable in relation to tap weights received by the multipliers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.