Method and apparatus for fast converging affine projection based echo canceller
US6700978B2 · kind B2 · utility
5Cited by
5References
36Claims
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Key dates
| Filing date | Sep 6, 2001 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Mar 24, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An adaptive filter estimates a channel weight vector of an echo channel using an affine projection (AP) update. The echo channel receives a send input sequence and a receive input sequence. The channel weight vector has first and second lengths when the adaptive filter operates in a first adaptation mode and a second adaptation mode, respectively. A delay estimator determines a delay in the echo channel using the adaptive filter in the first adaptation mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.