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Title: Time Domain Blind Source Separation of Non-Stationary Convolved Signals by Utilizing Geometric Beamforming
Authors: Robert Aichner
Shoko Araki
Shoji Makino
Tsuyoki Nishikawa
Hiroshi Saruwatari
Issue Date: Sep-2002
Publisher: IEEE
Start page: 445
End page: 454
Abstract: We propose a time-domain blind source separation (BSS) algorithm that utilizes geometric information such as sensor positions and assumed locations of sources. The algorithm tackles the problem of convolved mixtures by explicitly exploiting the non-stationarity of the acoustic sources. The learning rule is based on second-order statistics and is derived by natural gradient minimization. The proposed initialization of the algorithm is based on the beamforming principle. This method leads to improved separation performance, and the algorithm is able to estimate long unmixing FIR filters in the time domain due to the geometric initialization. We also propose a post-filtering method for dewhitening which is based on the scaling technique in frequency-domain BSS. The validity of the proposed method is shown by computer simulations. Our experimental results confirm that the algorithm is capable of separating real-world speech mixtures and can be applied to short learning data sets down to a few seconds. Our results also confirm that the proposed dewhitening post-filtering method maintains the spectral content of the original speech in the separated output.
Description: NNSP2002: the 12th IEEE International Workshop on Neural Networks for Signal Processing, September 4-6, 2002, Martigny, Valais, Switzerland.
ISBN: 0780376161
Rights: Copyright 2002 IEEE
Text Version: Publisher
Publisher DOI: 10.1109/NNSP.2002.1030056
Appears in Collections:情報科学研究科 / Graduate School of Information Science

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