Fourth European Conference on Speech Communication and Technology

Madrid, Spain
September 18-21, 1995

Utterance Verification Improves Closed-Set Recognition and Out-Of-Vocabulary Rejection

Don Colton, Mark Fanty, Ronald A. Cole

Center for Spoken Language Understanding, Oregon Graduate Institute, Portland, Oregon, USA

We report on utterance verification of putative recognitions in both open-set and closed-set recognition tasks using telephone speech. For open-set recognition, we report on rejection of out-of-vocabulary utterances. In a two-keyword task ("male" and "female") using 50% out-of-vocabulary utterances, utterance verification reduced errors by 60%, from 12% to 4.8% compared to our baseline rejection strategy. For closed-set recognition, we report on re-ordering the N-best hypotheses. In a 58-phrase task, utterance verification reduced closed-set recognition errors by 30%, from 6.5% to 4.5%.

Full Paper

Bibliographic reference.  Colton, Don / Fanty, Mark / Cole, Ronald A. (1995): "Utterance verification improves closed-set recognition and out-of-vocabulary rejection", In EUROSPEECH-1995, 1067-1071.