Localization of Multiple Speech Sources Based on Sub-band Steered Response Power

The steered response power with phase transform weighted (SRP-PHAT) is a robust sound source localization method based on microphone array. Multiple source localization has been implemented using SRP-PHAT with agglomerative clustering (AC). In this paper, a novel method of multiple speech source localization based on sub-band SRP is proposed. In this method, speech signal is divided into several sub-bands, where sub-band SRP is computed, initial estimations are generated by searching the maximum in every sub-band SRP, and the final source locations are determined from the initial estimations using AC. The proposed method is tested with the real-world recordings under the condition that the number of active speakers is unknown. The results show that our method provides higher localization performance than that of the conventional SRP-PHAT with AC in the cases with up to 3 concurrent speakers.