ex0820.m

数字信号处理（机械工业出版社）的源码

% Chapter 08: Example 8.20 Design a filter
n=55-1;
w=[0.4 0.6];
beta=0.1102*(60-8.7);
kw=kaiser(n+1,beta);
b=fir1(n,w,'stop',kw);
[h,w]=freqz(b,1,512,2);
plot(w,20*log10(abs(h))),grid on
xlabel('Normalized Frequency');ylabel('Magnitude(dB)');