Crystal-MUSIC: Accurate localization of multiple sources in diffuse noise environments using crystal-shaped microphone arrays

Authors:
Nobutaka Ito;Emmanuel Vincent;Nobutaka Ono;Rémi Gribonval;Shigeki Sagayama
Affiliations:
INRIA, Centre de Rennes - Bretagne Atlantique, Rennes Cedex, France and The University of Tokyo, Tokyo, Japan;INRIA, Centre de Rennes - Bretagne Atlantique, Rennes Cedex, France;The University of Tokyo, Tokyo, Japan;INRIA, Centre de Rennes - Bretagne Atlantique, Rennes Cedex, France;The University of Tokyo, Tokyo, Japan
Venue:
LVA/ICA'10 Proceedings of the 9th international conference on Latent variable analysis and signal separation
Year:
2010

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Abstract

This paper presents crystal-MUSIC, a method for DOA estimation of multiple sources in the presence of diffuse noise. MUSIC is well known as a method for the estimation of the DOAs of multiple sources but is not very robust to diffuse noise from many directions, because the covariance structure of such noise is not spherical. Our method makes it possible for MUSIC to accurately estimate the DOAs by removing the contribution of diffuse noise from the spatial covariance matrix. This denoising is performed in two steps: 1) denoising of the off-diagonal entries via a blind noise decorrelation using crystal-shaped arrays, and 2) denoising of the diagonal entries through a low-rank matrix completion technique. The denoising process does not require the spatial covariance matrix of diffuse noise to be known, but relies only on an isotropy feature of diffuse noise. Experimental results with real-world noise show that the DOA estimation accuracy is substantially improved compared to the conventional MUSIC.