窄带FIR数字滤波器是滤波器设计的关键课题，利用窄带滤波器可以减少设备的计算量，进而提高速度。本文档的目的是研究性能较好且运算量较小的窄带FIR数字滤波器。实现可以通过DSP编程完成。-Narrow-band FIR digital filter is a key issue in filter design, use of narrow-band filter can reduce the computational device, and then increase speed. The p