Estimation method and apparatus

Details Estimation method and apparatus Estimation method and apparatus

2005-03-18

2010-10-26

Jamal, Alexander (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

Reexamination Certificate

active

07822193

ABSTRACT:
A method and apparatus for producing an estimate of the acoustic response an environment. The method comprises receiving a first signal, and a second signal including a part of the first signal. The first and second signals are combined to produce a third signal. The first signal is combined with itself to produce a fourth signal. A plurality of weighted means of said third signal are computed and summed to produce a plurality of first summations. A plurality of weighted means of said fourth signal are computed and summed to produce a plurality of second summations. Said estimate is generated from said first and second summations.

REFERENCES:
patent: 2003/0210797 (2003-11-01), Kreifeldt et al.
patent: 1352394 (1987-11-01), None
“Local Splines in Signal Processing Applications: Low Complexity, High Accuracy,” Y.V. Zakharov and T.C. Tozer, Communication Research Group, Department of Electronics, University of York, York YO10 5DD, UK, pp. 1-5.
“Spectral Domain B-Spline Identification in Acoustic Echo Cancellation,” Y.Zakharov and T. Tozer, Department of Electronics, University of York, York YO10 5DD, UK, 4 pages.
IEICE Trans. Fundamentals, “Adaptive Cross-Spectral Technique for Acoustic Echo Cancellation,” vol. E82-A, No. 4, Apr. 1999, pp. 634-639.
IEEE Transactions on Speech and Audio Processing, “Recursive Identification of Acoustic Echo Systems Using Orthonormal Basis Functions,” Lester S. H. Ngia, vol. 11, No. 3, May 2003, pp. 278-293.

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