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F=50;
N=32;
T=0.00625;
x1=sin(2*pi*F*(0:N-1)*T);
X1=fft(x1);
phai0=pi/4;
x2=sin(2*pi*F*(0:N-1)*T+phai0);
X2=fft(x2);
f=(0:N-1)/T;
figure
subplot(221)
stem(f,abs(X1));
grid
subplot(223)
stem(f,abs(X2));
grid
subplot(222)
plot(f,unwrap(angle(X1)));
grid
subplot(224)
plot(f,unwrap(angle(X2)));
grid
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