Why fft is symmetric

Fast Fourier transform Discrete Fourier transform Preprocessor. Dual Computation action WordNet. Citation Type. Has PDF. Publication Type.

More Filters. Very fast computation of the radix-2 discrete Fourier transform. Quadtree and symmetry in FFT computation of digital images. View 1 excerpt. New algorithms for the FFT computation of symmetric and translational complex conjugate sequences.

Real-valued fast Fourier transform algorithms. Jim Clay Jim Clay I know what you are trying to say, however as you know , a sine correlates with a sine score 1 , but wont correlate at all with a cosine at all, score 0. They are the same signal, but with different phases afterall. There's another more serious problem too. I will fix it later. I have upvoted your answer, though, for doing the discrete math.

SE, and I hope that you will find the time to make your answer a truly great answer by explicitly including in your answer what is currently left for the reader to deduce: viz. In other words, I request that you edit your answer to be more responsive to the question actually asked as I requested in my previous comment.

Show 4 more comments. Dilip Sarwate Dilip Sarwate Is this natural or is it a tooling problem? So that's how they're related. Does that sound right? Add a comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Ask Question. Asked 9 years, 10 months ago. Active 1 year, 2 months ago.

Viewed 5k times. Improve this question. Aziz Shaikh Try a signal of alternate ones and negative ones with zeros between each. For a real FFT of length , this should give you a single peak at out[] the th frequency bin — Mark Borgerding.

Thanks Mark. I did that and it did give me a single peak at the th frequency bin, but I'm not sure what that means. Could you help me understand why in an audio track with input blocks of signals seems mirrored but this constructed signal didn't? Add a comment. Active Oldest Votes.

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