ex07013.m

数字信号处理（机械工业出版社）的源码

% Chapter 7: Example 7.13 filter design
%
n = 5; r = 20;
Wn = [100 200]/500;
[b,a] = cheby2(n,r,Wn);
freqz(b,a,128,1000); title('n=5 Chebyshev Type II Bandpass Filter')
figure
[y,t] = impz(b,a,101); 
stem(t,y); title('Impulse Frequency of n=5 Chebyshev Type II Filter ')