Method for cancelling multi-channel acoustic echo and multi-channel acoustic echo canceller
US6556682B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | May 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In order to cancel echo on several sound signal channels, the method consists in generating on each channel a synthetic signal having the spectral characteristics of a white noise; computing the frequency masking thresholds in several adjacent frequency bands using auditory perception properties; bringing in each frequency channel the synthetic signal level to the associated masking threshold value, so as to obtain an auxiliary signal, which is added to the signal associated with the loudspeaker of the channel concerned; supplying the resulting signal to an adaptive filter; adding the output signals of the associated adaptive filters to each microphone channel; subtracting the resulting signal received by the microphone of this channel; deducing an estimation error, on the basis of which the coefficients of the adaptive filters associated with this channel are corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.