An analysis of loudspeaker distortion in the context of acoustic echo cancellation
Keywords:Acoustic fields, Acoustic signal processing, Frequency domain analysis, Loudspeakers, Nonlinear analysis, Acoustic echo cancellation, Acoustic systems, Adaptive Volterra filters, Computationally efficient, Echo cancellation, Experimental measurements, Frequency domains, Hands-free, Linear portions, Nonlinear echo cancellers, Operating condition, Reduced complexity, Telephony systems, Wide-band
AbstractA study was conducted to analyze loudspeaker distortion based on experimental measurements obtained from several hands-free systems under various operating conditions. The results of the analysis revealed trends in the frequency domain nature of the loudspeaker distortion, providing insight into designing computationally efficient nonlinear echo cancellers. Adaptive Volterra filters were used to model the linear portion of the unknown acoustic system along with the nonlinear loudspeaker distortion to improve acoustic echo cancellation (AEC) performance as compared to echo cancellation (EC). It was demonstrated that reduced complexity nonlinear AEC structures based on adaptive Volterra filters were desirable for dealing with loudspeaker distortion with the introduction of wideband telephony systems.
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