Method of and apparatus for adaptation of an echo canceller in a system with multitasking
US6347141B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1998 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Aug 3, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An echo canceller has an adaptive filter with an input coupled to a digitized audio input producing samples at a first rate. The adaptive filter also produces an estimated digitized audio feedback signal at the first rate based upon a set of tap values. A controller is coupled to the adaptive filter and determines the values of the set of tap values. A shared processor is coupled to the adaptive filter and the controller. The shared processor services tasks of the adaptive filter and the controller as well as other devices. When the adaptive filter has converged upon an unknown echo channel response, the controller determines the set of tap values at a rate lower than the first rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.