Open AccessBook
Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography
Earl G. Williams,J. Adin Mann +1 more
TLDR
The Inverse Problem: Cylindrical NAH. as discussed by the authors The Inverse problem: Planar NAH and the Inverse NP-hardness of planar plane waves.Abstract:
Preface. Fourier Transforms & Special Functions. Plane Waves. The Inverse Problem: Planar NAH. Cylindrical Waves. The Inverse Problem: Cylindrical NAH. Spherical Waves. Spherical NAH. Green Functions & the Helmholtz Integral. Index.read more
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Proceedings ArticleDOI
DOA estimation of mixed near-field and far-field sources using spherical array
Qinghua Huang,Tao Song +1 more
TL;DR: A new approach which exploits the recursive relationship of spherical harmonics is proposed to estimate the direcitons of arrival (DOAs) of multiple mixed sources, independent of the far-field or near-field assumption in the spherical harminics domain.
Journal ArticleDOI
A comparison of measured room acoustics metrics using a spherical microphone array and conventional methods
TL;DR: In this paper, the results from a spherical microphone array (an mh acoustics Eigenmike-em32) compare to those from a traditional microphone setup (a Bruel & Kjaer Type-4192 omnidirectional microphone and a Sennheiser MKH30 figure-8 microphone).
Journal ArticleDOI
A 3D convolutional neural network based near-field acoustical holography method with sparse sampling rate on measuring surface
TL;DR: The application of the proposed CSA-NAH can cut down the measuring cost by reducing the number of microphones without wraparound error and reduce the error from more than 15% of the existing methods to 5.5%.
Proceedings ArticleDOI
A method for converting between cylindrical and spherical harmonic representations of sound fields
TL;DR: The consequences of spatial undersampling are investigated by converting between cylindrical and spherical harmonic decompositions of solutions to the wave equation and it is shown that the beamformer response becomes increasingly omnidirectional as the source moves away from the horizontal plane.
Related Papers (5)
A highly scalable spherical microphone array based on an orthonormal decomposition of the soundfield
Jens Meyer,Gary W. Elko +1 more