Third International Conference on Spoken Language Processing (ICSLP 94)
We have developed an automatic system for train-timetable information over the telephone that provides accurate connections between 1200 German cities. The caller can talk to it in unrestricted, natural, and fluent speech, very much like he or she would communicate with a human operator, and is not given any instructions beforehand. The speech recognizer of this system creates a word graph and passes it on to the speech understanding component. It is then parsed with a stochastic attributed context-free grammar that is used as a language model, to identify the relevant parts, and to compute their meaning. A dialogue manager analyses the results and either comes up with a new question or accesses the timetable database. The answer to this query, as well as the questions, are converted to spoken language by replaying appropriate pre-recorded phrases.
Bibliographic reference. Oerder, Martin / Aust, Harald (1994): "A realtime prototype of an automatic inquiry system", In ICSLP-1994, 703-706.