：次声波是信息领域中值得研究的一种信号，次声波的信息获取需要相应的检测装置。

本文介绍了以电容式次声波传感器检测次声波的原理、特性分析和信号处理方法，设计了以

89S51单片机为核心的智能型次声波检测装置，对系统软硬件设计进行了详细的说明-: Sub-sonic field of information worthy of study is a signal, time access to information requires a corresponding sound detection devices. This paper introduces the capacitive sensor infrasound infrasound principle, characterization and signal processing methods, designed to 89S51 microcontroller as the core of the intelligent sub-sonic detection devices, system software and hardware design of a detailed descr iption of