Dual beamform audio echo reduction
US9083782B2 · kind B2 · utility
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13References
20Claims
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Key dates
| Filing date | May 8, 2013 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Sep 20, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/6041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephonic device having a speakerphone function has a loudspeaker and a plurality of microphones. The plurality of microphones are coupled to a plurality of beamformers which produce a first beamform having a spatial null in the direction of the loudspeaker and a second beamform having a spatial null in the direction of near-end signals. The two beamforms are then processed to facilitate echo reduction. By comparing the beamform powers, a state of double-talk can be determined and the determination can be used to enhance echo reduction associated with speakerphone functionality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.