INTERSPEECH 2007
8th Annual Conference of the International Speech Communication Association

Antwerp, Belgium
August 27-31, 2007

Reducing Recognition Error Rate Based on Context Relationships Among Dialogue Turns

Hsu-Chih Wu (1), Stephanie Seneff (2)

(1) ITRI, Taiwan
(2) MIT, USA

We have recently been conducting research on developing spoken dialogue systems to provide conversational practice for a learner of a foreign language. One of the most critical aspects of such a system is speech recognition errors, since they often take the dialogue thread down a wrong turn that is very confusing to the student and may be irrecoverable. In this paper we report on a machine learning technique to assist the process of selection from a list of N-best candidates based on a high-level description of the semantics of the preceding dialogue. In a user simulation experiment, we show that a significant reduction in sentence error rate can be achieved, from 29.2% to 23.6%. We have not yet verified that our techniques hold for real user data.

Full Paper

Bibliographic reference.  Wu, Hsu-Chih / Seneff, Stephanie (2007): "Reducing recognition error rate based on context relationships among dialogue turns", In INTERSPEECH-2007, 2701-2704.