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Wednesday, July 10 • 11:10 - 11:30
SPHERICAL MICROPHONE ARRAY DESIGN AND VALIDATION: DOUBLE-LAYER VERSUS SIMPLE-LAYER ARRAY

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Sound field reproduction in three dimensions is possible using loudspeaker array. To capture spatial sound fields and assess sound field reproduction achieved by different loudspeaker array layouts, accurate microphone antennas are needed. In this context, spherical microphone arrays and spherical harmonics encoding are well suited. Such arrays are able to record frequency and spatial attributes of a sound field. However, the array diameter and the maximum spherical harmonic order it can reach dictate the effective frequency range of a spherical microphone array. A strategy to extend this frequency range is to combine multiple spherical layers in a single array. This means combining several spherical concentric arrays with different diameters. This paper focuses on the double-layer spherical array case. A brief review of double-layer spherical microphone array design is first provided. Then, a crossover and cross-order strategy is proposed to extend the effective frequency range of double-layer microphone arrays. Numerical simulations for multi-frequency plane waves, using double layer spherical microphone arrays are compared to the case of simple-layer microphone arrays.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
CH

Claes Hedberg

Professor, Blekinge Institute of Technology

Authors

Wednesday July 10, 2019 11:10 - 11:30 EDT
Westmount 2
  T01 Ac. meas. & instrum., SS01 Snd & vibr measur & analys