Conference_programme: 21.1 - Source localization and acoustic array processing

Lecture: Sparse volumetric reconstruction of the sound field in a room

Author(s): Fernandez-Grande Efren, Christiansen Rasmus Ellebæk

Summary:
Obtaining a volumetric reconstruction of the sound field in a room is challenging, as extensive measurements are required to sample and reconstruct the three-dimensional wave space. In order to alleviate the measurement requirements, sparse reconstruction methods, such as Compressive Sensing, can be used. The present study proposes a method for reconstructing the sound field in a room at low frequencies, based on a modal expansion of the sound field in wave number domain, using sparse reconstruction principles. The methodology is examined numerically and experimentally, based on measurements in a lightly-damped room. We examine the spatial sparsity of the sound field, and the coherence of the sensing matrix (i.e. the transfer matrix between measurement points and expansion coefficients), as fundamental conditions for obtaining a successful reconstruction.

Corresponding author

Name: Dr Efren Fernandez-Grande

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Country: Denmark