On spatial aliasing in microphone arrays
IEEE Transactions on Signal Processing
Dolph–Chebyshev beampattern design for spherical arrays
IEEE Transactions on Signal Processing
Design, Optimization and Evaluation of a Dual-Radius Spherical Microphone Array
IEEE/ACM Transactions on Audio, Speech and Language Processing (TASLP)
Generalized Spherical Array Beamforming for Binaural Speech Reproduction
IEEE/ACM Transactions on Audio, Speech and Language Processing (TASLP)
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Performance of microphone arrays at the high-frequency range is typically limited by aliasing, which is a result of the spatial sampling process. This paper presents analysis of aliasing for spherical microphone arrays, which have been recently studied for a range of applications. The paper presents theoretical analysis of spatial aliasing for various sphere sampling configurations, showing how high-order spherical harmonic coefficients are aliased into the lower orders. Spatial antialiasing filters on the sphere are then introduced, and the performance of spatially constrained filters is compared to that of the ideal antialiasing filter. A simulation example shows how the effect of aliasing on the beam pattern can be reduced by the use of the antialiasing filters