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- Title
Combining Superdirective Beamforming and Frequency-Domain Blind Source Separation for Highly Reverberant Signals.
- Authors
Lin Wang; Heping Ding; Fuliang Yin
- Abstract
Frequency-domain blind source separation (BSS) performs poorly in high reverberation because the independence assumption collapses at each frequency bins when the number of bins increases. To improve the separation result, this paper proposes a method which combines two techniques by using beamforming as a preprocessor of blind source separation. With the sound source locations supposed to be known, the mixed signals are dereverberated and enhanced by beamforming; then the beamformed signals are further separated by blind source separation. To implement the proposed method, a superdirective fixed beamformer is designed for beamforming, and an interfrequency dependence-based permutation alignment scheme is presented for frequencydomain blind source separation. With beamforming shortening mixing filters and reducing noise before blind source separation, the combinedmethod works better in reverberation. The performance of the proposedmethod is investigated by separating up to 4 sources in different environments with reverberation time from 100 ms to 700 ms. Simulation results verify the outperformance of the proposed method over using beamforming or blind source separation alone. Analysis demonstrates that the proposed method is computationally efficient and appropriate for real-time processing.
- Subjects
SIGNAL processing; AUDITORY scene analysis; BEAMFORMING; SIGNAL theory; INFORMATION measurement
- Publication
EURASIP Journal on Audio Speech & Music Processing, 2010, Vol 2010, p1
- ISSN
1687-4714
- Publication type
Article
- DOI
10.1155/2010/797962