Multi-source localization based on MUSIC-group delay algorithm of direct path dominance test under spherical microphone array
To address the phenomenon that sound source localization fails or the ability is insufficient due to multipath effect,scattering,diffraction,and other reasons in reverberation environment,a novel multi-sound source localization method based on MUSIC-group delay of direct path dominance test is proposed.Compared to the planar array,the spherical microphone array can obtain 3D sound field information.It can take advan-tage of the decoupling of the frequency component and angle component of the signals in the spherical harmonic domain.Meanwhile,the frequency smoothing technology can be directly used to process broadband speech signals without constructing a focusing matrix.In the spherical harmonic domain,a set of time-frequency components containing direct path of sound is selected to construct the MUSIC group time delay spatial spectrum by setting a threshold to detect the direct path of sound source among time-frequency bands.The measures mentioned above not only improve the localization robustness of direction of arrival estimation in a high reverberation environment,but also improve the resolution of multiple adjacent sound sources.The simulation results show that the novel MUSIC-group delay algorithm of direct path dominance test proposed in this paper has better positioning accuracy and better resolution of adjacent multiple sound sources under the high reverberation or low signal-to-noise ratio environments.
万方数据
维普
