A highly scalable spherical microphone array based on an orthonormal decomposition of the soundfield

By Jens Meyer, G. Elko. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2002

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Direction of Arrival Based Spatial Covariance Model for Blind Sound Source Separation (2014, unknown): “An emerging approach for beamforming based source separation is spherical array beamforming [27], [28] where a high number of densely spaced sensors in a physically small sphere is used to obtain uniform directivity properties towards every look direction.”
Further Investigations of High-Order Ambisonics and Wavefield Synthesis for Holophonic Sound Imaging (2003, background): “Indeed, theoretical studies regarding higher orders addressed recording systems based horizontal circular microphone arrays [5, 14] and more recently spherical arrays [12, 20-22].”
A Consolidated Perspective on Multimicrophone Speech Enhancement and Source Separation (2017, unknown): “Spherical microphone arrays [129], [130] have also at-tracted attention, due to their ability to symmetrically analyze tridimensional sound-ﬁelds [131]–[133] (see also dual-radius spherical arrays [134]).”