Dolph–Chebyshev beampattern design for spherical arrays
IEEE Transactions on Signal Processing
Spherical harmonic analysis of wavefields using multiple circular sensor arrays
IEEE Transactions on Audio, Speech, and Language Processing
Design, Optimization and Evaluation of a Dual-Radius Spherical Microphone Array
IEEE/ACM Transactions on Audio, Speech and Language Processing (TASLP)
Wavefield Analysis Over Large Areas Using Distributed Higher Order Microphones
IEEE/ACM Transactions on Audio, Speech and Language Processing (TASLP)
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Spherical microphone arrays have been studied for a wide range of applications, one of which is acoustic measurement and analysis. Since a minimal interaction between the array and the measured sound field is an advantage in this case, open-sphere arrays are preferable compared to rigid-sphere arrays. However, it has been shown that open-sphere arrays suffer from numerical ill-conditioning at frequencies which correspond to the nodal values of the spatial spherical modes with the result of excessive noise at these frequencies. A method for overcoming this problem using an open dual-sphere array is proposed in this correspondence and then investigated and compared to an array configured around a rigid sphere and an array composed of cardioid microphones. An optimal value for the ratio of the two spheres is derived, and simulation examples illustrating the advantage of the dual-sphere array are finally presented