Abstract:
A dialog control strategy was proposed based on the reliability of speech recognition. Receiving an utterance including several items of information, the dialog system using this strategy accepts those items that have been recognized reliably, while it rejects the rest of the items and asks the speaker to utter an utterance including the unaccepted items. The operation of the dialog system was mathematically analyzed under the assumption that the system can compute the reliability R(I) of each item of information, independently of the position of the item in a sentence and accept the item if R(I) is greater than a threshold t, and that the probability p that an item be accepted and the probability q that the accepted item be correct are given by a function of the threshold t. The analysis showed that the operation of the system could be described by a Markov process, and derived two important quantities N and Pac to evaluate the performance of the dialog system: N is the average number of turns taken between the speaker and the system until the system accepts all the items and Pac is the probability that all the items will be recognized correctly.