?? Error using ==> cheby1 The cutoff frequencies must be within the interval of (0,1).

fp=1500;
fs=5000;
Fs=22050;
rp=3;
rs=15;
wp=2*pi*fp/Fs;
ws=2*pi*fs/Fs;
T=1
wp=(2/T)*tan(wp/2);
ws=(2/T)*tan(ws/2);
[N,Wn]=cheb1ord(wp,ws,rp,rs,'s');%N为阶数，Wn为3dB对应频率
[b,a]=cheby1(N,Wn,'s'); %模拟滤波器系数
[bz,az]=bilinear(b,a,22050); %脉冲响应不变法求数字滤波器系数
[H,W]=freqz(bz,az);
figure(5)
plot(W*Fs/(2*pi),abs(H))
grid
title('滤波器频率响应曲线')

?? Error using ==> cheby1
The cutoff frequencies must be within the interval of (0,1).
而[b,a]=cheby1(N,Wn,'s'); 中N=2，Wn=0.43406，为什么不行呢

截止频率不能超过采样频率的一半

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