Echo cancellers and echo cancelling methods
US8619970B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2010 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Jul 9, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods and systems for updating the adaptive filter of an echo canceller. A method of updating the adaptive filter of an echo canceller in which an estimated echo is resolved from a received signal and then subtracted from an incoming echo-contaminated signal so as to produce a filtered output signal, includes: obtaining a corrected impulse response of an echo reconstruction filter (ERF); calculating specified decision measures usable to decide whether to prospectively apply the corrected ERF impulse response or a current ERF impulse response; determining whether application of the corrected ERF impulse response would result in improved echo cancellation; and updating the ERF to apply the corrected impulse response, when it is determined that the updating would result in a lower residual echo.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.