This paper describes the design and implementation of a natural language interface to a highly interactive space known as the Intelligent Room. We introduce a data structure called a recognition forest, which simplifies incorporation of non-linguistic contextural information about the human-level events going on in the Intelligent Room into its speech understanding system. This aim of using context has been to allow multiple applications-all of which support a relatively high degree of natural syntactic variability-to run simultaneously in the Intelligent Room.
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