Echo cancellation method and echo canceller implementing such a

Details Echo cancellation method and echo canceller implementing such a Echo cancellation method and echo canceller implementing such a

1998-01-15

2000-08-22

Chang, Vivian

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379390, 379406, 379409, 370289, H04B 323

Patent

active

061084131

ABSTRACT:
A reception signal is input to an echo generator system. An observation signal is gathered from the system. The reception signal is filtered to produce an echo prediction signal. The echo prediction signal is subtracted from the observation signal to produce an error signal. The observation signal is decomposed into M spectral components relating to different frequencies of the spectrum. M corresponding spectral components of the echo prediction signal are obtained. M quantities, each having a value with progressive variation representative of a degree of similitude between, respectively, one of the M spectral components of the observation signal and the corresponding spectral component of the echo prediction signal, are calculated. At least one spectral shaping of the error signal is carried out as a function of these M calculated quantities so as to adapt the filtering and/or to deliver the output signal from the echo canceller.

REFERENCES:
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 5163044 (1992-11-01), Golden
patent: 5305307 (1994-04-01), Chu
patent: 5418849 (1995-05-01), Cannalire et al.
patent: 5721782 (1998-02-01), Piket et al.
patent: 5856970 (1999-01-01), Gee et al.
patent: 5898928 (1999-04-01), Karlsson et al.
patent: 5933797 (1999-08-01), Hakansson et al.
J.J. Shynk, "Frequency-Domain and Multirate Adaptive Filtering", IEEE SP Magazine, pp. 15-37, Jan. 1992.
J. Boudy et al., "A Globally Optimised Frequency-Domain Acoustic Echo Canceller for Adverse Environment Applications", IEEE Proc. Internaltional Workshop on Acoustic Echo and Noise Control, R.o slashed.ros, Norway, pp. 95-98, Jun. 1995.
O.Ait Amrane et al., "Low-Delay Frequency Domain LMS Algorithm", IEEE Proc. ICASSP' 92, vol. 4, pp. 9-12, Mar. 23-26, 1992.
T. Gansler et al. "A Double-Talk Detector Based on Coherence", IEEE Transactions On Communications, vol. 44, No. 11, pp. 1421-1427, Nov. 1996.
F. Capman et al "Acoustic Echo Cancellation using a Fast QR-RLS Algorithm and Multirate Schemes", IEEE ICASSP'95, Detroit, 1995.
T. Gansler et al., "A Double Talk Detector Based on Coherence", Proc. of the International Conference on Signal Processing Applications & Technology, Boston, MA, USA, Oct. 24-26, 1995, pp. 332-336.
T.W. Wong et al., "Adaptive Filtering Using Hartley Transform and Overlap-Save Method", IEEE Transactions on Signal Processing, vol. 39, No. 7, pp. 1708-1711, Jul. 1991.
H.S. Malvar, "Extended Lapped Transforms: Properties, Applications, and Fast Algorithms", IEEE Transactions on Signal Processing, vol. 40, No. 11, pp. 2703-2714, Nov. 1992.
J.S. Soo et al., "A Multistep Size (MSS) Frequency Domain Adaptive Filter", IEEE Transactions on Signal Processing, vol. 39, No. 1, pp. 115-121, Jan. 1991.
J.S.Soo et al., "Multidelay Block Frequency Domain Adaptive Filter", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 38, No. 2, pp. 373-376, Feb. 1990.

Affiliated with

Also associated with

Rating

Echo cancellation method and echo canceller implementing such a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Echo cancellation method and echo canceller implementing such a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo cancellation method and echo canceller implementing such a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-589993