%Freqz函數：求解數字濾波器頻率響應
L=fir1(100,0.5,kaiser(101,6));
f=0:0.1:500;              %頻率范圍為0Hz——500Hz
figure(1);
freqz(L,1,f,1024);        %采樣頻率為1024Hz

b=[0.3 0.6 1];
a=[1 0.5 1];
w=logspace(-1,1);
figure(2);
freqs(b,a,w);