ex0811.m

数字信号处理（机械工业出版社）的源码

% Chapter 08: Example 8.11 30th-order lowpass filter
f = [0 0.6 0.6 1]; m = [1 1 0 0];
b = fir2(30,f,m);
[h,w] = freqz(b,1,128);
plot(f,m,w/pi,abs(h))
legend('Ideal','fir2 Designed')
title('Comparison of Frequency Response Magnitudes')