Echo cancellation filter

Details Echo cancellation filter Echo cancellation filter

2006-02-07

2006-02-07

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406080, C379S406110

Reexamination Certificate

active

06996229

ABSTRACT:
An echo canceler includes an adaptable filter that is updated during double-talk and far-end talk. The echo canceler receives a microphone signal that includes a near-end signal and echoes resulting from a far-end signal. The echo canceler whitens the far-end signal and decorrelates the microphone signal. The whitening and decorrelating is done as a preprocessing step for the one-unit blind source separation algorithm. A criterion of measure is used to emphasize the statistical independence of the echo canceled signal and the far-end signal. The echo cancellation problem is cast as a one-unit blind source separation problem. A one-unit blind source separation algorithm such as negentropy maximization can be used to extract the echo canceled signal.

REFERENCES:
patent: 4131767 (1978-12-01), Weinstein
patent: 4268727 (1981-05-01), Agrawal et al.
patent: 4712235 (1987-12-01), Jones, Jr.
patent: 5295136 (1994-03-01), Ashley et al.
patent: 5390250 (1995-02-01), Janse et al.
patent: RE35574 (1997-07-01), Russell et al.
patent: 5694474 (1997-12-01), Ngo et al.
patent: 5764753 (1998-06-01), McCaslin et al.
patent: 6002776 (1999-12-01), Bhadkamkar et al.
patent: 6151397 (2000-11-01), Jackson et al.
patent: 6181794 (2001-01-01), Park et al.
patent: 6272106 (2001-08-01), Kawahara et al.
patent: 6434110 (2002-08-01), Hemkumar
patent: 6507653 (2003-01-01), Romesburg
patent: 6516050 (2003-02-01), Tasaki et al.
patent: 6522747 (2003-02-01), Reilly et al.
patent: 6529606 (2003-03-01), Jackson, Jr. II et al.
patent: 2002/0114445 (2002-08-01), Benesty et al.
patent: 2002/0181699 (2002-12-01), Pham et al.
patent: 2002/0191779 (2002-12-01), Pham
International Searching Authority, International Search Report for PCT/US04/17897, dated Jan. 3, 2005, 2 pages.
International Searching Authority, Written Opinion of the International Searching Authority for PCT/US04/17897, dated Jan. 3, 2005, 3 pages.
Schobben et al., “A Frequency Domain Blind Signal Separation Method Based on Decorrelation,” IEEE Transactions on Signal Processing, vol. 50, No. 8, Aug. 2002, pp. 1855-1865, no day.
Torkkola, Karl, “Blind Deconvolution, Information Maximization and Recursive Filters,” Motorola, Phoenix Corporate Research Laboratories, 2100 East Elliot Road, MD EL508, Tempe, AZ 85284, USA, 4 pgs., no date.
Torkkola, Karl, “IRR Filters for Blind Deconvolution using Information Maximization,” Motorola, Phoenix Corporate Research Laboratories, 2100 East Elliot Road, MD EL508, Tempe, AZ 85284, USA, 14 pgs.
Feder, et al., “Maximum Likelihood Noise Cancellation Using the EM Algorithm,” IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 37, No. 2, Feb. 1989, pp. 204-216. No Day.
Glentis, et al., “A Unified View—Efficient Least Squares Adaptive Algorithms for FIR Transversal Filtering,” IEEE Signal Processing Magazine, Jul. 1999, pp. 13-41. No Day.
Breining, et al.,“Acoustic Echo Control—An Application of Very-High-Order Adaptive Filters,” IEEE Signal Processing Magazine, Jul. 1999, pp. 42-69. No Day.

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