Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

A Spoken Dialogue System Based on Hierarchical Feedback Mechanism

Akio Amano, Toshiyuki Odaka

Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan

This paper presents a "Hierarchical Feedback Mechanism" which improves user-friendliness of a spoken dialogue system. The authors have developed a spoken dialogue system whose application is a transportation guidance for several branches of Hitachi, Ltd[l]. The system consists of a speech recognition part, a speech synthesis part, an information retrieval part and a dialogue control part. Evaluation of this system reveals that the system has several problems such as, 1) Tt is not easy for users to speak to the system. 2) Users can not manage if a recognition error occurs. Main causes of these problems are the fact that users can not understand the status of the system behavior and that some system responses are not adequate for users to speak easily to the system. To solve these problems, the authors developed a "Hierarchical Feedback Mechanism". A basic idea is to show the status of the speech recognition part to the users. Since the speech recognition part has a hierarchical structure , showing the status of each unit in the speech recognition part is helpful information for the users. To achieve this, the authors introduced hierarchical feedback mechanism into the dialogue control part of the system. Trial use of 4 subjects confirmed the improvement of user-friendliness of the system.

Full Paper

Bibliographic reference.  Amano, Akio / Odaka, Toshiyuki (1994): "A spoken dialogue system based on hierarchical feedback mechanism", In ICSLP-1994, 871-874.