Acoustical echo canceller having an adaptive filter with passage into the frequency domain
US5848151A · kind A · utility
18Cited by
12References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1996 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Nov 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The echo canceller comprises an adaptive filter receiving the coefficients of a direct discrete transform into the frequency domain, computed on successive blocks of an input signal and fed via an inverse transform circuit to the subtractive input of an adder for forming an output signal going to the network, and an adaptor circuit for adapting the coefficients of the filter. The adaptor circuit receives the coefficients of successive transforms of blocks of output signal samples via a noise reducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.