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Full-Text Articles in Physical Sciences and Mathematics
Decorrelation: Sufficient For Convolutive Blind Source Separation?, Jiangtao Xi, T. Mei, Joe F. Chicharo, F. Yin
Decorrelation: Sufficient For Convolutive Blind Source Separation?, Jiangtao Xi, T. Mei, Joe F. Chicharo, F. Yin
Faculty of Informatics - Papers (Archive)
This paper considers blind separation of signal sources in a convolutive mixing environment. It tries to show that decorrelation is sufficient for separation of convolutively mixed sources. Two algorithms are also proposed and tested by computer simulations.
Integration Of Dft And Cosine-Modulated Filter Banks With Blind Separation Of Convolutively Mixed Non-Stationary Sources, I. Russell, Jiangtao Xi, Alfred Mertins, Joe F. Chicharo
Integration Of Dft And Cosine-Modulated Filter Banks With Blind Separation Of Convolutively Mixed Non-Stationary Sources, I. Russell, Jiangtao Xi, Alfred Mertins, Joe F. Chicharo
Faculty of Informatics - Papers (Archive)
In this paper, oversampled M channel FIR filter banks using both DFT modulation and cosine modulation designs are used in conjunction with a time domain blind source separation (BSS) algorithm I. Russell et al., (2003). This BSS algorithm has been shown to blindly separate the fullband versions of non-stationary convolutively mixed sources in the time domain. However further savings on convergence and computational complexity can be made by using subband decomposition on the mixed signals before implementation of the time domain BSS algorithm in each subband. An extended lapped transform (ELT) prototype is modulated using a cosine-modulated (CM) FIR filter …
Blind Source Separation Of Nonstationary Convolutively Mixed Signals In The Subband Domain, I. Russell, Jiangtao Xi, Alfred Mertins, Joe F. Chicharo
Blind Source Separation Of Nonstationary Convolutively Mixed Signals In The Subband Domain, I. Russell, Jiangtao Xi, Alfred Mertins, Joe F. Chicharo
Faculty of Informatics - Papers (Archive)
The paper proposes a new technique for blind source separation (BSS) in the subband domain using an extended lapped transform (ELT) decomposition for nonstationary, convolutively mixed signals. As identified by S. Araki et al. (see Proc. 4th Int. Symp. on Independent Component Analysis and Blind Signal Separation - ICA2003, p.499-504, 2003), the motivation for subband-based BSS is the drawback of frequency domain BSS when dealing with separating mixed speech signals over a few seconds resulting in few samples in individual frequency bins leading to poor separation performance. In the proposed approach, mixed signals are decomposed into subband components by an …
Flexible Multichannel Blind Deconvolution, An Investigation, Ah Chung Tsoi, L. S. Ma
Flexible Multichannel Blind Deconvolution, An Investigation, Ah Chung Tsoi, L. S. Ma
Faculty of Informatics - Papers (Archive)
In this paper, we consider the issue of devising a flexible nonlinear function for multichannel blind deconvolution. In particular, we consider the underlying assumption of the source probability density functions. We consider two cases, when the source probability density functions are assumed to be uni-modal, and multimodal respectively. In the unimodal case, there are two approaches: Pearson function and generalized exponential function. In the multimodal case, there are three approaches: mixture of Gaussian functions, mixture of Pearson functions, and mixture of generalized exponential functions. It is demonstrated through an illustrating example that the assumption on the source probability density functions …