While in foreign countries, more research is on non-stationary speech signal dereverberation, which becomes a hot field in the last ten years.

国外对不平稳语音信号去混响研究较多，特别是在最近十年形成了研究热点。

This paper introduced a measuring chamberlet method and character for flow-noise in seawater pipe system and analyzed inferior-limited frequency of reverberation of measuring chamberlet.

摘要介绍了海水管路系统声小方法及其特点，分析了小声场特性及产生混响下限频率。