Description  Claims  Drawing  Cited references 

Analysis and Design of Spherical Microphone Arrays   [0007] 
Three-Dimensional Surround Sound Systems Based on Spherical Harmonics   [0017] 
Beamforming for a Spherical-Aperture Microphone   [0020] 
Plane-wave decomposition of the sound field on a sphere by spherical convolution   [0021]