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Speech recognition errors are inevitable in a speech dialog system. This paper presents an error handling method based on correction grammars which recognize the correction utterances which follow a recognition error. Correction grammars are dynamically created from existing grammars and a set of correction templates. We also describe a prototype dialog system which incorporates this error handling method, and provide empirical evidence that this method can improve dialog success rate and reduce the number of dialog turns required for error recovery.

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An information kiosk with a JSL (Japanese sign language) recognition system that allows hearing-impaired people to easily search for various kinds of information and services was tested in a government office. This kiosk system was favorably received by most users.