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Altera_Forum's avatar
Altera_Forum
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8 years ago

FFT output spectrum generation

Hi all, I just have a simple question regarding to FFT output. I understand that the output of the real and imag signal have signed value, and these has to be divided by exponent value in orde...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

exponent scaling is for both real and imaginary output separately. Power is Re^2+Im^2 (without averaging) per bin of fft.

frequency of a bin = bin_index * sampling rate/fft resolution (for indices 0 - fft resolution/2-1), thereafter it is negative (mirror) = -(fft_resolution - bin_index) * sampling rate/fft resolution