Interspeech'2005 - Eurospeech
Takemaru-kun system is a practical speech-oriented guidance system developed to examine spoken interface through long-term operation in a public place that collected natural human-machine interaction data. In (2)004 the following advances improving reliability of the system were introduced, which conduced acquiring positive increase of access from users: (1) Rejection of unintended speech based on Gaussian Mixture Models (GMMs); (2) Removal of short, unnecessary inputs of impulsive noise; (3) Child or adult user discrimination; (4) Web-based monitoring mechanisms. This paper summarizes the Takemaru-kun system and analysis of 177,789 data collected by two-years actual operation. Experiments with the collected data proved that a combination of GMM-based verification and short input removal can excise 85% of the invalid inputs, including laughter, incomprehensible utterances, and even some background utterances.
Bibliographic reference. Nisimura, Ryuichi / Lee, Akinobu / Yamada, Masashi / Shikano, Kiyohiro (2005): "Operating a public spoken guidance system in real environment", In INTERSPEECH-2005, 845-848.