Ah, forgot to actually cite one thing: On 30.05.2016 14:49, Marcus Müller wrote: > >> I can't find its' implementation in anywhere so that I can't >> understand what happen in this function. > A DFT is performed, by calling the fftwf_execute function of the FFTw > library, which really, just executes a fast DFT. And because "DFT" is not totally unambiguous (because there are different normalization conventions out there), if you care for the actual formula, it's on http://www.fftw.org/doc/The-1d-Discrete-Fourier-Transform-_0028DFT_0029.html#The-1d-Discrete-Fourier-Transform-_0028DFT_0029 i.e. the backwards (inverse) n-point FFT is really just plain, old, boring, textbook
No normalization. Best regards, Marcus
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