Integration of a microphone array with acoustic echo cancellation and center clipping
US7831035B2 · kind B2 · utility
43Cited by
41References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 28, 2006 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Jun 29, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Center clipping is applied with acoustic echo suppression in a two-way voice communication system to reduce a microphone signal to the background noise floor when speech is not present. For integration with a microphone array, the center clipping processing determines whether speech is present based on estimates of the overall leak through and instantaneous microphone power across the microphone array channels. The overall estimates can be calculated as a dot product of the microphone array coefficients computed by a sound source localization process and separate estimates for the respective microphone channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.