Method of acoustic echo cancellation in full-duplex hands...

Details Method of acoustic echo cancellation in full-duplex hands... Method of acoustic echo cancellation in full-duplex hands...

2006-01-24

2006-01-24

Harold, Jefferey F. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S388040, C381S092000

Reexamination Certificate

active

06990193

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.

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Chapter 13 ofMicrophone Arrays. Signal Processing Techniques and Applicationsby Michael Branstein and Daren Ward, published by Springer Verlag. 2001, pp. 281-306.
W. Herbordt and W. Kellermann.Limits for Generalized Sidelob Cancellers with Embedded Acoustic Echo Cancellation. In Proc. Int. Conference on Acoustics, Speech and Signal Processing (ICASSP), Salt Lake City, USA, May 2001, 4 pgs.
H. Buchner, W. Herbordt and W. Kellermann.An Efficient Combination of Multi-Channel Acoustic Echo Cancellation With a Beamforming Microphone Array. Conf. Rec. International Workshop on Hands-free Speech Communication (HSC 2001), Kyoto, Japan, Apr. 2001. 4 pp.

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