Method of acoustic echo cancellation in full-duplex hands free audio conferencing with spatial directivity
US6990193B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2002 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Jul 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method is set forth of controlling an acoustic echo canceller at the output of a beamformer in an audio conferencing device. Information is saved to, and retrieved from, memory that characterizes each of a finite number of look directions, or regions of focus, covering the entire spatial span of the conferencing device. Each time a change occurs from a first look direction to a second look direction, information relating to the workspace captured by the acoustic echo canceller is saved for the first look direction, and previously saved information for the second look direction is retrieved from memory. The acoustic echo cancellation then takes place for the second look direction with the retrieved information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.