本文针对窄带信号频带有限的特点，利用采样率变换中的数据抽取和插入技术，提出了一种窄带信号压缩与重构算法。文中对抽取和插入过程中的关键环节滤波器也进行了讨论，并介绍了一种最平通带FIR滤波器设计方法。文章在最后还介绍了一个窄带信号的压缩和重建实例。 Aiming at the limited band of narrowband signal, this paper proposes a narrowband signal compression and reconstruction algorithm using the data extraction and insertion in the sampling rate conversion. The paper also discusses the key filter in the process of decimation and insertion, and introduces a design method of the flattest bandpass FIR filter. Finally, the article also introduced a narrow band signal compression and reconstruction examples.