International Symposium on Tonal Aspects of Languages
With Emphasis on Tone Languages

Beijing, China
March 28-31, 2004

Context Directed Speech Recognition in Dialogue Systems

Pengju Yan, Fang Zheng

Center for Speech Technology, State Key Laboratory of Intelligent Technology and Systems, Department of Computer Science & Technology, Tsinghua University, Beijing, China

For the time being, research and development on spoken dialogue systems (SDSs) become more and more important with the constant increasing demands. However, defects of the recognition strategies adopted for the sake of only laboratory demos are revealed evidently under the real-world circumstances, with the utterances of the casual style instead of the declamatory one. Both the shortage of domain-specific corpus and the existence of other empirical/heuristic knowledge appeal new methods to improve the recognition performance. Here we present a recognition framework where the dialogue contexts (DCs) are incorporated in as a restrictive source. Firstly, the idea of a focus expected (FE) under certain dialogue states is introduced. Secondly, the adaptation of lexicon and grammar rules is proposed. Finally, the recognition automaton generation under a specific FE is put forward. Experiments are carried out in the dialogue system EasyFlight, and the results show the effectiveness of the strategies.

Full Paper

Bibliographic reference.  Yan, Pengju / Zheng, Fang (2004): "Context directed speech recognition in dialogue systems", In TAL-2004, 225-228.