REPORT Taghizadeh_Idiap-RR-16-2011/IDIAP AN INTEGRATED FRAMEWORK FOR MULTI-CHANNEL MULTI-SOURCE LOCALIZATION AND VOICE ACTIVITY DETECTION Taghizadeh, Mohammad J. Garner, Philip N. Bourlard, Hervé Abutalebi, Hamid Reza Asaei, Afsaneh EXTERNAL https://publications.idiap.ch/attachments/reports/2011/Taghizadeh_Idiap-RR-16-2011.pdf PUBLIC Idiap-RR-16-2011 2011 Idiap June 2011 Two of the major challenges in microphone array based adap- tive beamforming, speech enhancement and distant speech recognition, are robust and accurate source localization and voice activity detection. This paper introduces a spatial gra- dient steered response power using the phase transform (SRP- PHAT) method which is capable of localization of competing speakers in overlapping conditions. We further investigate the behavior of the SRP function and characterize theoretically a fixed point in its search space for the diffuse noise field. We call this fixed point the null position in the SRP search space. Building on this evidence, we propose a technique for multi- channel voice activity detection (MVAD) based on detection of a maximum power corresponding to the null position. The gradient SRP-PHAT in tandem with the MVAD form an inte- grated framework of multi-source localization and voice ac- tivity detection. The experiments carried out on real data recordings show that this framework is very effective in prac- tical applications of hands-free communication.