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Human-machine interaction in meetings requires the localization and identification of the speakers interacting with the system as well as the recognition of the words spoken. A seminal step toward this goal is the field of rich transcription research, which includes speaker diarization together with the annotation of sentence boundaries and the elimination of speaker disfluencies. The sub-area of speaker diarization attempts to identify the number of participants in a meeting and create a list of speech time intervals for each such participant. In this paper, we analyze the correlation between signals coming from multiple microphones and propose an improved method for carrying out speaker diarization for meetings with multiple distant microphones. The proposed algorithm makes use of acoustic information and information from the delays between signals coming from the different sources. Using this procedure, we were able to achieve state-of-the-art performance in the NIST spring 2006 rich transcription evaluation, improving the Diarization Error Rate (DER) by 15% to 20% relative to previous systems.
Speech source separation, speaker diarization, speaker segmentation, meetings recognition, rich transcription

X. Anguera, J. Pardo and C. Wooters, "Speaker Diarization For Multiple-Distant-Microphone Meetings Using Several Sources of Information," in IEEE Transactions on Computers, vol. 56, no. , pp. 1212-1224, 2007.
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