firdaitongchebyandhanmmingbijiao.m

matlab是集数学计算、图形处理和程序语言设计于一体的软件

Wn=[0.4,0.7];
n=28;
b1=fir1(n,Wn);
w=chebwin(n+1,30);
b2=fir1(n,Wn,window);
[H1,W1]=freqz(b1,1,512,2);
[H2,W2]=freqz(b2,1,512,2);
subplot(2,1,1);
plot(W1,20*log(abs(H1)));
xlabel('归一化频率');
ylabel('幅度/dB');
subplot(2,1,2);
plot(W2,20*log(abs(H2)));
xlabel('归一化频率');
ylabel('幅度/dB');