è¾å®æ´çé¢è°±å¾ï¼
设æ½æ ·é¢ç为Fsï¼Hzï¼,ä¿¡å·ç¹æ°ä¸ºNï¼ä¿¡å·åºå为xã
f = fftshift(fft(x));
w = linspace(-Fs/2, Fs/2, N);%é¢çåæ ï¼åä½Hz
plot(w,abs(f));
title('ä¿¡å·çé¢è°±');
xlabel('é¢ç(Hz)');
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