TY - CONF T1 - Active speech source localization by a dual coarse-to-fine search T2 - 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01) Y1 - 2001 A1 - Duraiswami, Ramani A1 - Zotkin,Dmitry N A1 - Davis, Larry S. KW - active speech source localization KW - array signal processing KW - Computer interfaces KW - Delay effects KW - delay estimation KW - delay-based estimators KW - dual coarse-to-fine search KW - Frequency KW - Inverse problems KW - Laboratories KW - multiple speech sound sources KW - Position measurement KW - real-time implementation KW - Sensor arrays KW - Signal processing algorithms KW - space KW - speech KW - Speech processing KW - Teleconferencing KW - videoconferencing systems AB - Accurate and fast localization of multiple speech sound sources is a significant problem in videoconferencing systems. Based on the observation that the wavelengths of the sound from a speech source are comparable to the dimensions of the space being searched, and that the source is broadband, we develop an efficient search strategy that finds the source(s) in a given space. The search is made efficient by using coarse-to-fine strategies in both space and frequency. The algorithm is shown to be robust compared to typical delay-based estimators and fast enough for real-time implementation. Its performance can be further improved by using constraints from computer vision JA - 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01) PB - IEEE VL - 5 SN - 0-7803-7041-4 M3 - 10.1109/ICASSP.2001.940366 ER -