Localization of multiple acoustic sources based on spherical microphone arrays

In this paper sound pressure is sampled through spherical microphone array.Sound field can be decomposed by spherical harmonics and a signal model is built.Based on the model,MUSIC algorithm is adopted to estimate the positions of multiple acoustic sources.However this method fails when the signals are coherent,especially near to each other.Therefore a new petal-blocking method is proposed based on spatial smoothing to improve localization effect.A 72-element spherical microphone array is applied to the simulation.The results show that this method can localize multiple coherent sources and resist noise.