A circular microphone array may be assembled on the spot by combining the built-in microphones of several smartphones in a circular layout. The present work investigates different designs of such ad-hoc smartphone arrays that would allow the implementation of spatial audio techniques formulated in the circular harmonic domain. The tested techniques include circular harmonic beamforming for Direction-Of-Arrival estimation and noise reduction, as well as spatial post-filters for additional background noise suppression. The evaluation of the different designs is performed using a simulated dataset of a multi-speaker event. The comparisons are done with objective metrics, as well as with a subjective listening test.
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