Post-nonlinear undercomplete blind signal separation: A Bayesian approach

C. Wei*, L. C. Khor, W. L. Woo, S. S. Dlay

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The post-nonlinear undercomplete Blind Signal Separation problem is solved by a Bayesian approach in this paper. The proposed algorithm applies the Generalized Gaussian model to approximate the prior distribution probability and a Maximum a Posteriori (MAP) based learning algorithm to estimate the source signals, mixing matrix and the nonlinearity of the mixing process. The mixing nonlinearity is modeled by a Multilayer Perceptron (MLP) neural network. In our proposed algorithm, the source signals, mixing matrix and the parameters of the MLP are iteratively updated in an alternate manner until they converges to a fixed value. The noise variance is regarded as the hyper-parameter which is estimated in a closed form. Simulations based on real audio have been carried out to investigate the efficacy of the proposed algorithm. A performance gain of over 125% has been achieved when compared to linear approach.

Original languageEnglish
Title of host publication2006 IEEE International Conference on Acoustics, Speech, and Signal Processing - Proceedings
PublisherIEEE
Volume5
ISBN (Print)142440469X
DOIs
Publication statusPublished - 24 Jul 2006
Event2006 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2006 - Toulouse, France
Duration: 14 May 200619 May 2006

Conference

Conference2006 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2006
CountryFrance
CityToulouse
Period14/05/0619/05/06

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