gonglvpu_x.m

来自「一个小小的c语言编程」· M 代码 · 共 17 行

function gonglvpu_x(x)
figure(20),
clf reset
str='X功率谱分析 ';
set(gcf,'name',str,'numbertitle','off');

if mod(length(x),2)~=0
    x(length(x)+1)=0;
end
f1=fft(x);
f2=conj(f1);
normal=f1.*f2;
axis_x=([1:length(x)]*0.014).\1;

grid on,hold on,
plot(log(normal),'k'),
%axis([0,100,0,100]);