Modelling source directivity in room impulse response simulation for spherical microphone arrays

In this work we present a new room impulse response simulation for spherical microphone arrays taking into account source directivity. We calculate the emission angle of the sound ray leaving the source based on the location of the image and the receiver using Allen and Berkley´s image method. We provide an implementation of a room impulse response simulator for a spherical microphone array including a directional source with arbitrary directivity. We validate our implementation considering the zeroth and the first-order reflections. Our results show a worst-case directional gain error of 7% in comparison with theoretical predictions.