Acoustic sources joint localization and characterization using compressed sensing

Abstract

International audienceIn this work, a Compressed Sensing (CS) strategy is developed in order to jointly achieve two complementary tasks regarding sound sources: localization and identification. Here, the sources are assumed sparse in the spatial domain, and greedy techniques are used for their localization. The case of coherent sources located in a plane is studied both numerically and experimentally at different frequencies. Results show that, in this framework, CS source localization is reliable using a significantly smaller number of microphones than classical techniques (standard or high resolution beamforming techniques), while overcoming some of their pitfalls. We then use a similar technique for the identification of the source nature, i.e. its radiation pattern, and here the sparsity domain is extended to a basis of elementary radiating functions. We present simulation and experimental results using calibrated sources and measurements performed with a 3D array of 80 randomly distributed microphones. This study investigates the limitations of Compressed Sensing in terms of resolution and reliability of the identification, with respect to the number of sensors, the signal to noise ratio and the density of the reconstruction region

Cramér-Rao bounds for the localization of anisotropic sources

“…• generalizations of the MUSIC (MUltiple SIgnal Classification) algorithm [3,4] EM is now in IRIT (INPT, UPS, UT2J, UT1, CNRS), 118 route de Narbonne F-31062 Toulouse, CEDEX 9 • or group-sparsity models and corresponding identification methods (mixed-norms, block matching pursuits, etc.) [5].…”