与理论分析结果相比，窗函数法设计一个数字带通FIR滤波器，FIR 底通和带通滤波器和IIR 底通和带通滤波器。- Compared with the results of theoretical analysis, A window function design FIR digital band-pass filter, Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter.