Why should I use 2 fftshift?
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Hello if I have signal x (in time domain).
I saw that sometimes people do fftshift(fft(ffshift(x))). Now, I understand the usage of fftshift to move the DC to the center. But what's the reasoning behind using fftshift twice?
Seems to me that fftshift(fft(x)), should be enough.
Am I missing something here?
Thanks
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Walter Roberson
le 31 Juil 2015
You can test it yourself to see if the two are equal.
The magnitudes of the two are equal, but the real and imaginary components are different.
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