29t.m

来自「包含50个数字信号处理方面的matlab程序」· M 代码 · 共 18 行

clc;
close all;
clear all;
Rp=1;Rs=40;fs=1000;
ws1=0.25*pi;ws2=0.8*pi;
wp1=0.4*pi;wp2=0.7*pi;
wp3=(2*fs)*tan(wp1/2);
wp4=(2*fs)*tan(wp2/2);
ws3=(2*fs)*tan(ws1/2);
ws4=(2*fs)*tan(ws2/2);
wp=[wp3,wp4];
ws=[ws3,ws4];
[n,wn]=cheb2ord(wp,ws,Rp,Rs,'s')
[b,a]=cheby2(n,Rs,wn,'bandpass','s');
[bz,az]=bilinear(b,a,fs);
[db,mag,pha,grd,w]=freqz_m(bz,az);
subplot(2,1,1);plot(w/pi,db);axis([0,1,-100,10]);
subplot(2,1,2);plot(w/pi,pha);