采用多级级联方法降低了对硬件运算速度的要求，有利于实时处理；采用余弦滤波器改善了阻带衰减不足；内插二阶多项式滤波器补偿了 CIC 滤波器通带内的衰减；抗混叠低通滤波器减小了混叠影响-Using multi-stage cascade approach reduces hardware requirements for computing speed, real-time processing in favor　cosine filter improves the stop-band attenuation inadequate　second-order polynomial interpolation filter compensates for the attenuation of the CIC filter passband　anti- aliasing low-pass filter reduces the effects of aliasing