Utterance promoting methods on speech dialog systems

New dialog promoting methods for voice storage dialog systems are discussed. The paper describes two hypotheses that attempt to put at ease those callers who hesitate or are shy by designing an interactive dialog or offering attractive information to the caller. The following two hypotheses are introduced. The first is the less information per utterance required by the system, the more comfortable the user feels. The second is the more attractive the information is that is given after an utterance by the system, the more the caller will want to have a message. The experimental conditions are explained to evaluate the previous hypotheses using an opinion score. The system consists of a PC, telephone line interface board, and control software. For eliminating the effect of recognition accuracy, dialogs are designed without speech recognition. Finally, the experimental results are described which indicate the usefulness of each hypothesis, and in addition these results show an increase of 0.7-0.8 points in a mean opinion score