Estimating Directions of Multiple Sound Sources Using Tetrahedral Microphone Array

Localization of sound sources by microphone array is one of the important problems. This work proposes the method for sound localization using tetrahedraly-coordinated microphone arrays. This is based on the method provided by Berdugo et al. which estimates the time delays between each pair of microphones for an individual frequency. We achieved efficient three-dimensional DOA estimation with no bias, including following two improvements: spherical pseudo-histogram defining source-density function (SDF), and using the weighted addition of the past histograms. The performance has been evaluated by performing the simulation experiments for static speakers and the experiments for moving speakers. In the simulation experiments, we assumed one static speaker and additional white noise. We evaluated the performance by calculating the success estimation rate as the direction of the speaker varies. The experiments for moving speakers were performed in typical office. The results in both simulations and experiments show the effectiveness of our proposal