Combining Acoustic and Pragmatic Features to Predict Recognition Performance in Spoken Dialogue Systems

We use machine learners trained on a combination of acoustic confidence and pragmatic plausibility features computed from dialogue context to predict the accuracy of incoming n-best recognition hypotheses to a spoken dialogue system. Our best results show a 25% weighted f-score improvement over a baseline system that implements a "grammar-switching" approach to context-sensitive speech recognition.

• Type: Conference
• Year: 2004
• Where: ACL
• Authors: Malte Gabsdil, Oliver Lemon
• Keywords: ACL 2004, ACL 2007, Context-Sensitive Speech Recognition, Pragmatic Plausibility Features, Spoken Dialogue System