%0 Conference Paper %B 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01) %D 2001 %T Active speech source localization by a dual coarse-to-fine search %A Duraiswami, Ramani %A Zotkin,Dmitry N %A Davis, Larry S. %K active speech source localization %K array signal processing %K Computer interfaces %K Delay effects %K delay estimation %K delay-based estimators %K dual coarse-to-fine search %K Frequency %K Inverse problems %K Laboratories %K multiple speech sound sources %K Position measurement %K real-time implementation %K Sensor arrays %K Signal processing algorithms %K space %K speech %K Speech processing %K Teleconferencing %K videoconferencing systems %X 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 %B 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01) %I IEEE %V 5 %P 3309-3312 vol.5 - 3309-3312 vol.5 %8 2001/// %@ 0-7803-7041-4 %G eng %R 10.1109/ICASSP.2001.940366