Noise-level adaptive residual echo suppressor
US6959167B1 · kind B1 · utility
9Cited by
16References
16Claims
0Family size
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Key dates
| Filing date | Aug 10, 2001 |
| Grant date | Oct 25, 2005 |
| Priority date | — |
| Expiry date | Feb 24, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5491
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved echo control system has an adaptive controlled echo canceling filter arrangement in which a background filter updates the filter coefficients of an echo shaping filter responsive to a normalized least mean square (NLMS) algorithm. An adaptive control module determines a weighted reference signal for the background filter in which the weight is proportional to a far signal reference and an estimate of the norm of an echo canceller error vector, and inversely proportional to en estimate of a residue of the echo canceller. And a non-linear normalized convergence term is used in the NLMS algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.