DFT(Discrete Fourier Transform)
2016-08-23
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clear all;
clc;
N=128;
n=0:1:N-1;
k=0:1:N-1;
X=cos(2*pi*100/400*n);
WN=exp(-j*2*pi/N);
nk=n'*k;
WNnk=WN.^nk;
Xk=X*WNnk;
magX=abs(Xk);
phasX=angle(Xk*180/pi);
subplot(2,1,1); plot(k,magX);a
clc;
N=128;
n=0:1:N-1;
k=0:1:N-1;
X=cos(2*pi*100/400*n);
WN=exp(-j*2*pi/N);
nk=n'*k;
WNnk=WN.^nk;
Xk=X*WNnk;
magX=abs(Xk);
phasX=angle(Xk*180/pi);
subplot(2,1,1); plot(k,magX);a
subplot(2,1,2); plot(k,phasX);
matlab
dft
离散
变换
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