Ecole d'ingénieur et centre de recherche en Sciences du numérique

Acoustic echo cancellation in non-linear and noisy environment

Mossi, Moctar; Yemdji, Christelle; Evans, Nicholas; Beaugeant, Christophe

Research report RR-10-240, May 25th, 2010

This paper presents a new assessment of four approaches to acoustic echo cancellation in the presence of non-linear echo. The comparison is performed with algorithms that are configured to give equivalent performance under linear-only echo conditions, thereby giving a more meaningful assessment. We also compare the effect of non-linear echo to that of noise and show that, whilst performance differs in non-linear environments, there are negligible differences in noisy environments. The computationally efficient FBLMS algorithm is shown to perform as well as other algorithms in noisy environments but performs poorly under non-linear echo conditions. We also show how the correlation between non-linearities and the speech signal can corrupt the echo path estimate and leads to small attenuation of non-linear components at the expense of reduced attenuation for linear echo. Finally we discuss the merits of modelling non-linearities as a linear environment with a time varying echo path.

Document Bibtex

Titre:Acoustic echo cancellation in non-linear and noisy environment
Mots Clés:echo cancellation, non-linear distortion, noise, AEC, LMS, NLMS, APA, FBLMS
Type:Rapport
Langue:English
Ville:
Date:
Département:Sécurité numérique
Eurecom ref:3033
Copyright: © EURECOM. Personal use of this material is permitted. The definitive version of this paper was published in Research report RR-10-240, May 25th, 2010 and is available at :
Bibtex: @techreport{EURECOM+3033, year = {2010}, title = {{A}coustic echo cancellation in non-linear and noisy environment}, author = {{M}ossi, {M}octar and {Y}emdji, {C}hristelle and {E}vans, {N}icholas and {B}eaugeant, {C}hristophe }, number = {EURECOM+3033}, month = {08}, institution = {Eurecom}, url = {http://www.eurecom.fr/publication/3033},, }
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