Efficient sampling for scanning spherical array
David Alon and Boaz Rafaely
Spherical microphone arrays have been studied for a wide range of applications. In particular microphones arranged around an open sphere are useful in scanning microphone arrays for sound field analysis. However, open-spheres have been shown to have poor robustness at frequencies related to the zeros of the spherical Bessel functions. This paper presents a new dual ellipsoid shape configuration, which achieves high robustness, with a relatively small number of sampling points. The special geometry of the ellipsoid surface is generated due to a mechanical offset, which allow a full measurement session with one continuous motion of a single microphone.