Graduate School and Research Center in Digital Sciences

A comparison of different loudspeaker models to empirically estimated non-linearities

Gudupudi, Leela K; Beaugeant, Christophe; Evans, Nicholas; Mossi, Moctar; Lepauloux, Ludovick

HSCMA 2014, 4th Joint Workshop on Hands-free Speech Communication and Microphone Arrays, May 12-14, 2014, Nancy, France

This paper investigates and questions the suitability of modelling non-linear loudspeaker distortion with scalar diagonal (SD) Volterra series. This approach, popular in studies of non-linear acoustic echo cancellation (NAEC), is compared to an alternative non-scalar diagonal (NSD) model. The new model is estimated empirically but based on the theoretical underpinnings of non-linear convolution. Using common, real-speech test signals, the loudspeaker outputs synthesised by each model are evaluated objectively through their comparison to real loudspeaker outputs measured in controlled conditions. Results show that non-linear distortion estimated with the NSD model better reflects that measured empirically. We also show that NAEC experiments conducted with SD loudspeaker models have the potential to over-exaggerate performance, whereas those conducted with an NSD model better reflect practical performance.

Document Doi Bibtex

Title:A comparison of different loudspeaker models to empirically estimated non-linearities
Keywords:Nonlinear acoustic echo cancellation, Volterra series, non-linear convolution
Department:Digital Security
Eurecom ref:4253
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Bibtex: @inproceedings{EURECOM+4253, doi = {}, year = {2014}, title = {{A} comparison of different loudspeaker models to empirically estimated non-linearities}, author = {{G}udupudi, {L}eela {K} and {B}eaugeant, {C}hristophe and {E}vans, {N}icholas and {M}ossi, {M}octar and {L}epauloux, {L}udovick}, booktitle = {{HSCMA} 2014, 4th {J}oint {W}orkshop on {H}ands-free {S}peech {C}ommunication and {M}icrophone {A}rrays, {M}ay 12-14, 2014, {N}ancy, {F}rance}, address = {{N}ancy, {FRANCE}}, month = {05}, url = {} }
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