Open Access

Wavelet-Based MPNLMS Adaptive Algorithm for Network Echo Cancellation

EURASIP Journal on Audio, Speech, and Music Processing20072007:096101

DOI: 10.1155/2007/96101

Received: 30 June 2006

Accepted: 24 January 2007

Published: 19 March 2007


The μ-law proportionate normalized least mean square (MPNLMS) algorithm has been proposed recently to solve the slow convergence problem of the proportionate normalized least mean square (PNLMS) algorithm after its initial fast converging period. But for the color input, it may become slow in the case of the big eigenvalue spread of the input signal's autocorrelation matrix. In this paper, we use the wavelet transform to whiten the input signal. Due to the good time-frequency localization property of the wavelet transform, a sparse impulse response in the time domain is also sparse in the wavelet domain. By applying the MPNLMS technique in the wavelet domain, fast convergence for the color input is observed. Furthermore, we show that some nonsparse impulse responses may become sparse in the wavelet domain. This motivates the usage of the wavelet-based MPNLMS algorithm. Advantages of this approach are documented.


Authors’ Affiliations

Freescale Semiconductor
Department of Electrical and Computer Engineering, The George Washington University


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© H. Deng and M. Doroslovački. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.