Acoustic echo-cancellation system

Details Acoustic echo-cancellation system Acoustic echo-cancellation system

2005-05-17

2005-05-17

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Dereverberators

C381S093000, C379S406010

Reexamination Certificate

active

06895093

ABSTRACT:
A multi-channel acoustic cancellation system40with, for example, stereo speakers and a pair of microphones in the transmitting and receiving rooms (11and21) has time varying all-pass filters (45, 47) in the signal path between the microphones (13, 15) in the transmitting room (11) and the speakers (27, 29) in the receiving room (21) to provide decorrelation.

REFERENCES:
patent: 4063034 (1977-12-01), Peters
patent: 5661813 (1997-08-01), Shimauchi et al.
Ali, Murtaza Stereophonic Acoustic Echo Cancellation System Using Time-Varying All-Pass Filtering For Signal Decorrelation ICASSP '98. proceedings of the 1998 IEEE International Conference on, vol. 6, May 12-15, 1998, pp. 3689-3692 vol. 6.*
Jacob Benesty et al., “A Better Understanding and an Improved Solution to the Problems of Stereophonic Acoustic Echo Cancellation,”IEEE, pp. 303-306, 1997.
Suehiro Shimauchi and Shoji Makino, “Stereo Projection Echo Canceller with True Echo Path Estimation,”IEEE, pp. 3059-3062, 1995.
M. Mohan Sondhi et al., “Stereophonic Acoustic Echo Cancellation-An Overview of the Fundamental Problem,”IEEE Signal Processing Letters, vol. 2, No. 8, pp. 148-151, Aug. 1995.

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