At our institute a speech understanding and dialog system is developed. As an example we model an information system for timetables and other information about intercity trains. In understanding spoken utterances, additional problems arise due to pronunciation variabilities and vagueness of the word recognition process. Experiments so far have also shown that the syntactical analysis produces a lot more hypotheses instead of reducing the number of word hypotheses. The reason for that is the possibility o! combining nearly every group of word hypotheses which are adjacent with respect to the speech signal to a syntactically correct constituent. .
