Method and circuit arrangement for compensating cross-talk and/or echo signals
US4688245A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1984 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Dec 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/238
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an adaptive crosstalk and/or echo compensation circuit which is arranged on the four-wire side parallel to a hybrid circuit and which has a variable filter and a compensation signal logic-linking element, the compensation signal is formed in dependence upon the, possibly averaged, difference between a decision device output signal formed following the signal compensation and following an adaptive signal equalization, and the decision device input signal. In the case of a greater, possibly averaged, difference between the decision device input and output signals, the filter coefficients are set in accordance with the compensated received signal, or only the sign thereof, and in the case of a smaller, possibly averaged, difference, the filter coefficients are set in accordance with this difference, or only the sign thereof. A compromise equalization of the received signal can take place prior to the crosstalk and/or echo compensation. Following the crosstalk and/or echo compensation, first a regulated amplification can take place, here the setting signal for the variable filter, which signal is derived from the difference between the decision device input and output signals, and w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.