Echo suppression and echo cancellation

Details Echo suppression and echo cancellation Echo suppression and echo cancellation

2006-08-29

2006-08-29

Swerdlow, Daniel (Department: 2615)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406050

Reexamination Certificate

active

07099460

ABSTRACT:
Echo canceling method including the steps of determining an Euclidean norm of an echo-replica signal, determining an Euclidean norm of an input signal, determining a gradient step size, correcting the coefficients of an adaptive filter, deriving an updated echo-replica signal, and determining an updated error signal by subtracting the updated echo-replica signal from the input signal.

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Breining, C., Control of a Hands-Free Telephone Set, Received Aug. 26, 1996; Revised Feb. 17, 1997 and Mar. 29, 1997, 13 pages (pp. 131-143), Signal Processing, European Journal Devoted to the Methods and Applications of Signal Processing, NL. Elsevier Science Publishers, B.V. Amsterdam, vol. 61, No. 2.
Benesty, J. et al., Multi-Channel Adaptive Filtering Applied to Multi-Channel Acoustic Echo Cancellation, 4 pages (pp. 1405-1408, vol. 2, 1996, Signal Processing: Theories and Applications, Proceedings of Eusipco, XX, XX.

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