Key-Phrase Spotting Technique Used in Telephone Dialog System Accessing E-mails via Voice

摘要

This paper discusses a usage of key-phrase spotting technique implemented in a real-time telephone dialog system designed and constructed at the Department of Cybernetics, University of West Bohemia, and its contribution to speech recognition and understanding. The paper is concerned about e-mail retrieving and reading service, which is controlled through the telephone. Our approach is to give to the user more convenience and allow him/her to spoke with the system. Users can control the system by predefined phrases. The problem arising in this case is that the user is not able to use only one predefined phrase at the given dialog state but rather tell the system his/her request nearly in a naturally way. To permit user to communicate more naturally and to control the system more intuitively we implemented a simple understanding module based on a key-phrase spotting technique. The paper describes an implementation of the key-phrase spotting method using a mumble model, a finite state grammar format and the structure of the mumble model. The paper also shows how special dialog applications can handle language understanding using the key-phrase spotting technique and VoiceXML. Results achieved during the experimental system usage and testing conditions are included.