Multimodal Speaker Segmentation in Presence of Overlapped Speech Segments
We propose a multimodal speaker segmentation algorithm with two main contributions: First, we suggest a hidden Markov model architecture that performs fusion of the three modalities: a multi-camera system for participant localization, a microphone array for speaker localization, and a speaker identification system; second, we present a novel method for dealing with overlapped speech segments through a likelihood model of the microphone array observations that uses multiple local maxima of the Steered Power response generalized cross correlation phase transform (SPR-GCC-PHAT) function in the joint probabilistic data association (JPDA) framework. Results show that the proposed method outperforms standard speaker segmentation systems based on: (a) speaker identification and; (b) microphone array processing, for datasets with the significant portion (27.4%) of overlapped speech, and scores as high as 94.4% on the F-measure scale.