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基于查询扩展的中文语音高效检索

, PP. 561-566

Keywords: 中文语音检索,分词,查询扩展,有穷自动机,基于令牌的搜索

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Abstract:

中文语音检索系统用于快速准确地在中文语音文档中定位用户查询。典型实现方案对语音文档进行识别后建立索引,对查询串进行分词并以分词结果检索。检索过程中出现的查询分词与识别结果不匹配将影响系统性能。为解决该问题,产生多种查询分词结果,并对其进行前后缀扩展后检索。为解决因扩展带来的检索内容过多,用时较长的问题,引入有穷自动机压缩扩展,在此基础上设计基于令牌的搜索算法高效检索。实验证明,对查询的多分词与前后缀扩展可以使检索EER相对提升50%~70%,引入FSA可压缩检索空间,使得检索速度提升近30倍。

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