Echo canceller and echo cancelling method
US6442273B1 · kind B1 · utility
6Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Mar 14, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/234
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to provide an echo canceller capable of generating, when the double-talk detection precision is degraded and the learning of a filter coefficient swings by noises, an echo replica signal using a filter coefficient having a low degree of error at the time of detecting a double-talk state. A backup filter coefficient is calculated by adding a predetermined weighting factor times a filter coefficient obtained by the learning and a predetermined weighting factor times the preceding backup filter coefficient stored in second storage means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.