Paek, T., Gandhe, S., Chickering, D., Ju, Y.
Proceedings of ACL 2007 Speechgram Workshop: Grammar-based approaches to Spoken Language Processing
(Prague, June 2007)
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In command and control (C&C) speech interaction, users interact by speaking commands or asking questions typically specified in a context-free grammar (CFG). Unfortunately, users often produce out-of-grammar (OOG) command, which can result in misunderstanding or non-understanding. We explore a simple approach to handling OOG commands that involves generating a backoff grammar from any CFG using filler models, and utilizing that grammar for recognition whenever the CFG fails. Working within the memory footprint requirements of a mobile C&C product, applying th approach yielded a 35% relative reduction in semantic error rate for OOG commands. It also improve partial recognitions for enabling clarification dialogue.
