说明：  音频针对音频检索任务中的关键词检索提出一种新的基于拼音图的两阶段检索系统,可以高效地从大量语音数据中检索出感兴趣的文本信息,从而达到为国家安全服务的目
(Audio for audio retrieval mission in the keyword search, a new map based on the phonetic two-stage retrieval system can be efficient from a large number of voice data to retrieve the text information of interest to achieve the national security service head)