Optimization of a spherical microphone array geometry for localizing acoustic sources using the generalized cross-correlation technique

Type de document

Études primaires

Année de publication

2019

Langue

Anglais

Titre de la revue

Mechanical Systems and Signal Processing

Première page

546

Dernière page

559

Résumé

Many workers are exposed daily to excessive noise levels. In order to reduce the noise exposure at the workstation, the main noise sources have to be detected. This task can be done with a microphone array and a source localization technique. Previous studies have shown promising results with time domain beamforming based on the generalized cross-correlation technique. The objective of this work is to propose an optimal spherical microphone array geometry dedicated to this technique. A cost function based on the symmetry of the aperture angle maps is proposed and is maximized using a Nonlinear Optimization by Mesh Adaptive Direct Search. Numerical results show that the optimized geometry improves the noise source map by reducing the side lobe amplitude without increasing the main lobe surface. Experimental measurements are carried out in a semi-anechoic chamber with prototyped spherical microphone arrays confirming that the optimized microphone array improves the quality of the noise source map.

Mots-clés

Carte de bruits, Noise chart, Instrument de mesure, Measuring instrument, Propagation du son, Sound propagation, Description du matériel, Description of equipment, Évaluation du matériel, Evaluation of equipment, Lutte contre le bruit, Noise control, Préservation de l'ouïe, Hearing conservation, Mesure du bruit, Noise measurement, Microphone

Numéro de projet IRSST

2015-0075

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