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EUROSPEECH 2003 - INTERSPEECH 2003
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EUROSPEECH 2003 - INTERSPEECH 2003
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Recently, the performance of speech recognition was drastically improved, and the products with the interface based on speech recognition have been realized. However, when we communicate with computers through a speech interface, misrecognition is inevitable, and it is difficult to recover from it because of the immaturity of the interface. Users try to recover from misrecognition by a repetition of the same content. So, the detection of user's repetition is helpful for a system to detect its misunderstanding, and to recover from the misrecognition. In this paper, we assume the utterance which includes repetitions a correction and propose a method to detect correction utterances in spontaneously spoken dialog using a word spotting based on DTW (dynamic time warping) and N-best hypotheses overlapping measure. As a result, we achieved recall rate of 92.7% and precision of 89.1%. Moreover, we tried to improve recognition accuracy using the detection. Using the choice of vocabulary and grammar setup based on the detection, we achieved improvement in recognition performance from 42.7% to 50.0% for correction utterance and from 70.5% to 77.9% for non-correction utterance.
Bibliographic reference. Kitaoka, Norihide / Kakutani, Naoko / Nakagawa, Seiichi (2003): "Detection and recognition of correction utterance in spontaneously spoken dialog", In EUROSPEECH-2003, 625-628.