Graduate School and Research Center in Digital Sciences

Dual channel echo postfiltering for hands-free mobile terminals

Yemdji, Christelle; Mossi Idrissa, Moctar; Evans, Nicholas; Beaugeant, Christophe; Vary, Peter

IWAENC 2012, International Workshop on Acoustic Signal Enhancement, September 4-6, 2012, Aachen, Germany

In mobile communications, speech is often degraded by ambient noise and acoustic echo. Both problems have attracted a high level of research interest over the last decades. Recently dual channel solutions for noise reduction have been investigated and can yield better performance than single channel solutions. This paper presents an analysis of the echo problem based on recordings with a handsfree dual channel mock-up phone and proposes a novel residual echo power spectral density (PSD) estimator that uses two microphone signals instead of one. The proposed PSD estimate is compared to an existing single channel residual echo PSD estimator before being assessed within an echo postfilter. Our experiments show that the proposed dual-channel echo PSD outperforms the single channel postfilter, especially at low signal to echo ratios.

Document Bibtex

Title:Dual channel echo postfiltering for hands-free mobile terminals
Keywords:echo postfiltering, dual channel, relative transfer function
Type:Conference
Language:English
City:Aachen
Country:GERMANY
Date:
Department:Digital Security
Eurecom ref:3740
Copyright: Copyright VDE Verlag. Personal use of this material is permitted. The definitive version of this paper was published in IWAENC 2012, International Workshop on Acoustic Signal Enhancement, September 4-6, 2012, Aachen, Germany and is available at :
Bibtex: @inproceedings{EURECOM+3740, year = {2012}, title = {{D}ual channel echo postfiltering for hands-free mobile terminals}, author = {{Y}emdji, {C}hristelle and {M}ossi {I}drissa, {M}octar and {E}vans, {N}icholas and {B}eaugeant, {C}hristophe and {V}ary, {P}eter}, booktitle = {{IWAENC} 2012, {I}nternational {W}orkshop on {A}coustic {S}ignal {E}nhancement, {S}eptember 4-6, 2012, {A}achen, {G}ermany}, address = {{A}achen, {GERMANY}}, month = {09}, url = {http://www.eurecom.fr/publication/3740} }
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