Acoustic echo cancellation using a variable length adaptive filter
US8879720B2 · kind B2 · utility
0Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2013 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Mar 17, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/568
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An audio conferencing system having a base station, a loud speaker and one or more microphones generally operates to receive a F.E. audio signal, play the signal, and to receive a N.E. audio signal at the microphone that includes the F.E. audio signal modified by an echo path and a N.E. audio signal. The base station includes an adaptive filter whose length is controlled to be variable depending upon activity detected at each of one or more filter elements comprising the adaptive filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.