Using prewhitening and stepsize control to improve the performance of the LMS algorithm for acoustic echo compensation

Author

Frenzel, Rudi ; Hennecke, Marcus E.

Author_Institution

Inst. fuer Netzerk- und Signaltheorie, Tech. Hochschule Darmstadt, Germany

Volume

4

fYear

1992

fDate

3-6 May 1992

Firstpage

1930

Abstract

An implementation of a compensator for acoustical echoes is presented. The algorithm consists of an adaptive transversal filter which is adjusted according to a modified version of the well-known normalized least mean square (NLMS) procedures. Decorrelation filters were added to improve the convergence. The step size was also varied according to the noise level to achieve the best performance in noisy environments. Some results are included of real-time measurements of the behavior in typical operating conditions, such as in hands-free telephone equipment, demonstrating the performance of the system

Keywords

adaptive filters; compensation; convergence; echo suppression; filtering and prediction theory; least squares approximations; signal processing; LMS algorithm; acoustic echo compensation; adaptive transversal filter; convergence; decorrelation filters; hands-free telephone equipment; noise level; noisy environments; normalized least mean square; prewhitening; stepsize control; Adaptive filters; Convergence; Decorrelation; Finite impulse response filter; Least squares approximation; Neodymium; Noise level; Speech; Transversal filters; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-0593-0

Type

conf

DOI

10.1109/ISCAS.1992.230432

Filename

230432