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Inverse fft with real result

Question asked by fluxfrog on May 12, 2015
Latest reply on Jun 3, 2015 by Mitesh


I am using the rfft library function to compute the FFT of a real input signals. Unfortunately, there is no equivalent inverse function for the IFFT, and I have to fallback to the full complex cfft. This really wastes memory and CPU cycles. Does anyone know of a trick to use the rfft function to compute the inverse fft? I know there are such tricks for the regular FFT, but I can't really figure out if there is one for the real valued case.