Comparison between the NLMS and the NLMF Adaptation Algorithms Applied on Volterra Filters for Nonlinear Acoustic Echo Cancellation
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2011, Vol 8, Issue 2
Abstract
A nonlinear acoustic echo cancellation setup using a third order Volterra filter is proposed in this article. The assorted types of nonlinearities encountered in the Loudspeaker-Enclosure-Microphone system are modelled by different length Volterra kernels. The adaptation of the kernels is achieved employing both the Normalized Least Mean Square and the Normalized Least Mean Fourth algorithms. The comparison between these methods is performed in terms of Echo Return Loss Enhancement in order to emphasise the differences and similarities regarding the rate of convergence and the steady-state of the error in each case. In simulations, the behaviour of the proposed structures is underlined for two types of input audio signals at different noise levels. The nonlinearity degree is kept constant throughout the simulations. Experimental results show the appropriate adaptive Volterra method for each acoustic noise scenario separately.
Authors and Affiliations
Marina ŢOPA, Cristian CONŢAN
Keywords
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