?? exa080401.m
字號:
%-----------------------------------------------------------------------------------
% exa080401.m for example 8.4.1 and fig8.4.2
% 說明一個三通道濾波器組的頻率響應
% h0(n),h1(n): 來自文獻 [Ngu89]
%-----------------------------------------------------------------------------------
clear;
h= [-0.0429753 -0.0927704 0.0429888
0.0000139 0.0000008 -0.0000139
0.1489104 0.0087654 -0.1489217
0.2971954 0.0000226 0.2972354
0.3537539 0.1864025 -0.3537496
0.2672266 -0.0000020 0.2672007
0.0870758 -0.3543303 -0.0870508
-0.0521155 -0.0000363 -0.0520909
-0.0875973 0.3564594 0.0875786
-0.0427096 -0.0000049 -0.0427067
0.0474530 -0.1931082 -0.0474452
0.0429618 0.0000230 0.0429677
0.0 0.0 0.0
-0.0232765 -0.0000026 -0.0232749
0.0000022 0.0 0.0000022];
h0=h(:,1);
h1=h(:,2);
h2=h(:,3);
[H0,w]=freqz(h0,1,512,1);
[H1,w]=freqz(h1,1,512,1);
[H2,w]=freqz(h2,1,512,1);
H00=20*log10(abs(H0+0.0000001));
H11=20*log10(abs(H1+0.0000001));
H22=20*log10(abs(H2+0.0000001));
plot(w,H00,'b-',w,H11,'k-',w,H22,'r-');
grid on;
title('H0 H1 H2');
ylabel(' dB');
hold on;
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