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Blind signal separation using overcomplete subband representation

Grbic, Nedelko (author)
Tao, Xiao-Jiao (author)
Nordholm, Sven (author)
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Claesson, Ingvar (author)
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IEEE, 2001
2001
English.
In: IEEE transactions on speech and audio processing. - : IEEE. - 1063-6676 .- 1558-2353. ; 9:5, s. 524-533
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • This paper discusses a multirate filterbank-based extended infomax algorithm for real-world signal separation, i.e., convolved mixtures separation. Since convolution in the time domain corresponds to instantaneous mixing in the frequency domain, polyphase subband projection naturally becomes an efficient alternative to the Fourier transform based frequency domain approach. The online implementation proposed is featured by a simultaneous inverse channel identification in the frequency domain and signal filtering in the time domain. It is shown that an over-representation structure reduces aliasing between different bands and results in more accurate inverse channel estimates. Therefore, it provides better performance than the Fourier transform based structure in the measures of both separation and distortion. The performance limitation of the method is also evaluated in terms of the Wiener solution.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Keyword

Blind system identification
microphone array

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ref (subject category)
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Grbic, Nedelko
Tao, Xiao-Jiao
Nordholm, Sven
Claesson, Ingvar
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ENGINEERING AND TECHNOLOGY
ENGINEERING AND ...
and Electrical Engin ...
and Signal Processin ...
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Blekinge Institute of Technology

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