《DSP using MATLAB》示例Example7.22

代码：

h = [1, 2, 3, 4, 3, 2, 1]/15;
M = length(h); n = 0:M-1;
[Hr, w, a, L] = Hr_Type1(h);
a
L

amax = max(a) + 1; amin = min(a) - 1;

figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Exameple 7.22‘)
set(gcf,‘Color‘,‘white‘); 

plot(w/pi, Hr); grid on;
xlabel(‘frequency in \pi units‘); ylabel(‘Hr‘); title(‘Type-1 Amplitude Response‘);

　　运行结果：

从上图看出，在开区间(0，π)有L-1=2个极值点；误差函数有L+3=6个极值点。

时间： 2024-10-21 23:23:48

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