1. fdesign.decimator
例如:設定好采樣頻率Fs, 信號帶寬Fp, 阻帶衰減As, 差分時延m及降采樣比D就可以得到cic濾波器的傳輸函數
d1 = fdesign.decimator(D,'CIC',m,Fpass,As,Fs);
Hcic = design(d1);
2. mfilt.cicdecim (fixed-point CIC decimator, mfilt是matlab裏專門用來設計多速率信號處理濾波器的壹套函數)
hm = mfilt.cicdecim(decimation_factor,differential_delay,NumberofSections);
decimation_factor為降采樣比,differential_delay同上為差分時延,NumberofSections為cic濾波器的節數,與第壹個函數相比,這個函數沒有規定采樣濾波,通帶寬度、阻帶衰減等