Frequency-Domain Adaptive Kalman Filter for Acoustic Echo Control in Handsfree Telephones

Authors:

Enzner, G. ,  Vary, P.

Journal:

(SIGPRO)

Volume:

86

Page(s):

1140 - 1156

number:

6

Date:

Jun. 2006

Note:

Special Issue on Applied Speech and Audio Processing (dedicated to Prof. Hänsler)

Language:

English

Abstract

Acoustic echo canceler and postfilter for residual echo suppression are two essential building blocks of a hands-free voice communication system. Based on the Kalman filter theory, we derive a simple and advanced algorithm for the optimum joint statistical adaptation of both filter coefficients in time-varying and noisy acoustic environments. The Kalmar filter utilizes a stochastic state-space model of the acoustic echo path which is formulated entirely in the frequency-domain. The resulting adaptive algorithm is computationally efficient and inherently robust, i.e., the adaptation does not require additional regularization or control mechanisms.

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