The Design and Implementation of Campus Navigation System: EasyNav
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In this paper we present the design and the implementation of a Chinese spoken language dialogue system named EasyNav which is for Tsinghua University Campus Navigation. By analyzing the features and requirements of spoken language dialogue system, we design a rule based language understanding procedure that is suitable to it. The syntactic parser applies the GLR algorithm to process the Context Free Grammar(CFG), whose purpose is to extract features of syntactic structure for use by the semantic parser. The syntactic grammar is designed for the trade off between the coverage and the accuracy. The semantic parser matches sentence templates with syntactic constraints, so as to find speaker′s intention. The semantic parser resolves the ambiguity induced by the syntactic parser. The advantage of the design is that the system can be easy to construct and extend.