[問題] FFT f=0時有振幅已回收
我遇到一在頻率(f)=0時有振幅的問題，照理來說這地方應該是無振幅，
請問大家有遇到跟我一樣的情況嗎? 有高手可以幫我解答一下嗎 謝謝。
我的程式
L = length(X0_2(1:2048));
Fs = 1/7200;
NFFT = 2^nextpow2(L); % Next power of 2 from length of y
Y = fft(X0_2(1:2048),NFFT)/L;
f = Fs/2*linspace(0,1,NFFT/2+1);
amp = 2*abs( Y(1:NFFT/2+1) );
phs = unwrap(angle(Y));
plot(f,2*abs(Y(1:NFFT/2+1)))
title('Single-Sided Amplitude Spectrum of y(t)')
xlabel('Frequency (Hz)')
ylabel('|Y(f)|')
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