Real-time speaker localization and speech separation by audio-visual integration

Robot audition in real-world should cope with motor and other noises caused by the robot´s own movements in addition to environmental noises and reverberation. This paper reports how auditory processing is improved by audio-visual integration with active movements. The key idea resides in hierarchical integration of auditory and visual streams to disambiguate auditory or visual processing. The system runs in real-time by using distributed processing on 4 PCs connected by a Gigabit Ethernet. The system implemented in a upper-torso humanoid tracks multiple talkers and extracts speech from a mixture of sounds. The performance of epipolar geometry based sound source localization and sound source separation by active and adaptive direction-pass filtering is also reported.