Spherical Harmonic Decomposition of a Sound Field Using Microphones on a Circumferential Contour Around a Non-Spherical Baffle

Spherical harmonic (SH) representations of sound fields are usually obtained from microphone arrays with rigid spherical baffles whereby the microphones distributed over entire surface baffle. We present a method that overcomes requirement for baffle to be spherical. Furthermore, can placed along circumferential contour around This greatly reduces required number given spatial resolution compared conventional arrays. Our is based on analytical solution SH decomposition observations equator sphere we presented recently. It incorporates calibration stage in which signals due suitable set projected onto those same notional by means linear filtering operation. The filter coefficients computed data via least/squares fit. an evaluation application binaural rendering 18/element array uses human head as and provides 8th ambisonic order. analyse accuracy robustness our simulated well measured prototype.