exa4_16.m

新版Matlab 7辅助信号处理技术与应用

% exa4-16_cheb1low.m , for example 4-16
% using chebyshev I filter to design lowpass DF

clear all;
Wp=100;
Rp=3;
Ws=200;
Rs=30;
Fs=1000;
[N,Wn]=cheb1ord(Wp/(Fs/2),Ws/(Fs/2),Rp,Rs);
[b,a] = cheby1(N,Rp,Wn);
freqz(b,a,512,1000);