Open Access

Exploiting Acoustic Similarity of Propagating Paths for Audio Signal Separation

EURASIP Journal on Advances in Signal Processing20032003:187841

DOI: 10.1155/S1110865703306031

Received: 20 September 2002

Published: 5 October 2003

Abstract

Blind signal separation can easily find its position in audio applications where mutually independent sources need to be separated from their microphone mixtures while both room acoustics and sources are unknown. However, the conventional separation algorithms can hardly be implemented in real time due to the high computational complexity. The computational load is mainly caused by either direct or indirect estimation of thousands of acoustic parameters. Aiming at the complexity reduction, in this paper, the acoustic paths are investigated through an acoustic similarity index (ASI). Then a new mixing model is proposed. With closely spaced microphones (5–10 cm apart), the model relieves the computational load of the separation algorithm by reducing the number and length of the filters to be adjusted. To cope with real situations, a blind audio signal separation algorithm (BLASS) is developed on the proposed model. BLASS only uses the second-order statistics (SOS) and performs efficiently in frequency domain.

Keywords

blind signal separation acoustic similarity noncausality

Authors’ Affiliations

(1)
Faculty of Electrical Engineering, Eindhoven University of Technology
(2)
Storage Signal Processing Group, Philips Research Laboratories
(3)
University of Sichuan

Copyright

© Copyright © 2003 Hindawi Publishing Corporation 2003