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clear all%窗口函数%nl=40;window=boxcar(nl);wl=window;figure(l);stem(wl);%非平稳信号产生fs=1000;a=O:l/fs:l;fO=O;fl=150;yl=chirp(a,fOzl,fl);x=yl(l:510);figure(2);Plot(x);%短时傅里叶变换% t=l:length(x);n=length(x);tfr;t,f=tfrstft(x,tznzwlzO); contour(t,fzabs(tfr)clcclear all为窗口函数外nl=40;window=boxcar (nl);wl二window;figure(l);stem(wl);%非平稳信号产生为fs=1000;a=O:l/fs:l;fO=O;fl=150;yl=chirp (a, fO, 1, fl);x=yl(1:510);figure (2);plot(x);%短时傅里叶变换外t=l:length(x);n=length(x);S, F, T, P二spectrogram (x, wl, 32, 256);surf(T, F, 10*logl0(abs(P);axis tight;view(0, 90);
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