Frequency domain stereophonic acoustic echo canceller utilizing non-linear transformations
US6694020B1 · kind B1 · utility
10Cited by
14References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1999 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Sep 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention is a multiple channel teleconferencing system employing a stereophonic acoustic echo canceler that exploits the coherence between multiple channels. In accordance with the invention a small non-linearity is incorporated into each channel path between the microphone and the speaker and an efficient frequency domain adaptive algorithm is implemented in the echo canceler circuit. The frequency domain algorithm converges to a solution much more quickly, than, for instance, a time domain, normalized least mean squares, solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.