  Rigid spherical microphone arrays (RSMAs) have been widely used in ambisonics
sound field recording. While it is desired to combine the information captured
by a grid of densely arranged RSMAs for expanding the area of accurate
reconstruction, or sweet-spots, this is not trivial due to inter-array
interference. Here we propose multiple scattering ambisonics, a method for
three-dimensional ambisonics sound field recording using multiple acoustically
interacting RSMAs. Numerical experiments demonstrate the sweet-spot expansion
realized by the proposed method. The proposed method can be used with existing
RSMAs as building blocks and opens possibilities including higher
degrees-of-freedom spatial audio.
