Adaptive nonlinear processor for echo cancellation
US6424635B1 · kind B1 · utility
40Cited by
14References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1998 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Nov 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An echo canceler including a processor to adjust a dynamic clipping amplitude threshold for use in determining whether or not to clip outgoing audio. The dynamic clipping amplitude threshold is increased when the ratio of residue echo over echo is decreased over a prescribed period of time. The residue echo is taken as a difference between a true echo and an estimated echo initially emulated by the echo canceler. Likewise, when this ratio is increased over the prescribed period of time, the dynamic clipping amplitude threshold is decreased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.