Acoustic echo cancellation solution for video conferencing
US8391472B2 · kind B2 · utility
5Cited by
7References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2007 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Dec 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Echo cancellation for audio/video conferencing uses an inaudible tone added at an originating conference site to the transmitted voice signal, for echo cancellation. The tone, upon receipt with the voice signal at a remote conferencing site and retransmission back to the originating site, is used to determine both the round trip delay of the conferencing link and the acoustic characteristics of the remote site, so as generate an echo cancellation signal for better audio performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.