Residual echo estimation for echo cancellation
US6859531B1 · kind B1 · utility
12Cited by
5References
27Claims
0Family size
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Key dates
| Filing date | Sep 15, 2000 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Jan 3, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Real and imaginary components of the discrete Fourier transform (DFT) of the residual echo in an acoustic echo cancellation system are separately estimated using mapping functions derived without an assumption of statistical independence between separate components of a near-end microphone input signal. The residual echo estimator calculates the real and imaginary components using an approximation of the microphone input signal without the echo. A different approximation is used depending on whether the near-end talker and/or the far-end talker are talking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.