System for cancelling echo signals
US4937813A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Feb 16, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/231
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An adaptive compensator circuit is provided which includes a first echo compensator, responsive to data signals from the transmitter, for providing a first compensation signal for compensating an echo signal component which is linearly related to the digital signals to be transmitted. A second echo compensator, responsive to both the first compensation signal and the corrected received signal provides a second compensation signal for compensating the nonlinear echo signal component. An adder, responsive to the first and second echo compensation signals, provides a summed compensation signal. The data signals from the receiver are corrected by means of the summed compensation signal. In another embodiment, the second echo compensator is responsive to both the corrected received signal and the current symbol being transmitted by the transmitter and the (N-1) preceding symbols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.