The narrow band FIR filter based on multi-sampling rate of digital signal processing theory is designed and realized on DSP.

基于多抽样率数字信号处理原理，设计窄带FIR滤波器，并在DSP芯片上实现。

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This paper studies high decimation ratio of digital downconverter given narrow-band signal, and especially analyze mul? stage decimation algorithm based on CIC filter and HB filter.

本文研究了窄带信号条件下，高倍抽取的数字下变频设计，重点分析了基于CIC滤波器和HB滤波器的多级抽取算法。

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