Acoustic Echo Cancellation Using Mismatched Filter Techniques

Authors:

Antweiler, C. ,  Dörbecker, M. ,  Antweiler, M.

Book Title:

Proceedings of International Workshop on Acoustic Echo and Noise Control (IWAENC)

Pages:

p.p. 87-93

Address:

Plestin les Geves, France

Date:

Sep. 1993

Language:

English

Abstract

Adaptive echo cancellation techniques are presently used to implement hands free telephone sets. The LMS-algorithm, or least-mean-square algorithm, represents the most common adaption technique for acoustic echo control [1].
The use of maximum-length sequences, also called m-sequences, to determine the impulse response of a particular electro-acoustic transmission system is well known in applications such as acoustic irradiation systems [2]. Furthermore, for m-sequences the Fast Hadamard Transformation can be applied to minimize the computational complexity [3].
In this contribution a combined implementation of an echo compensator exploiting mismatched filter techniques and the conventional LMS-algorithm is proposed. The corresponding model is illustrated in Fig. 1.

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