Echo cancelling device providing adjustment of the echo canceller coefficients during full-duplex transmission
US5132963A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/238
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In the echo-cancelling device of the invention new decision-error directed algorithms are developed which permit to maintain adaptivity of the echo coefficients and perform precise tracking of the far-end echo phase in a computationally efficent manner during full-duplex operation. The echo-cancelling device comprises an adjust device (40) performing the minimization of the mean-square error obtained as the difference between the signal at the output of the equalizer (Z) and the data-symbol decision (a), for providing the adjustment of the near echo estimator (20) coefficients, of the far echo estimator (22) coefficients, and of the phase (26) of the estimated far echo.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.