SynthMaker

Getting the Imaginary Part Out of an FFT

Archive · 2010 4 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

almpepe ·

Hey Guys!

Could you help me - I want to make an FFT analyzer, but instead of using the real part of the result, I want to use the IMAGINARY part of it. I believe this will give me the spectral PHASE information of the analyzed sound instead of the spectral AMPLITUDE information. How do I do this in SynthMaker?

Thanks.

MegaHurtz ·

the phase is already in the fft 🙂 I beleive it`s yust an inverse of your sound.

MichaelBenjamin ·

yes i think the imaginary is just the mirrored real part so its not the phase, but why not take that? you need to put the sound to an mem array, then read it out with the "mem to float array min max" then put that float array into the fft module, and then, just route like you want.

almpepe ·

Thanks. Actually, it was as simple as rewiring a connection from the "Amplitude" output of the GraphFFT to the "Phase" output, and it spit out the imaginary part and graphed it. The only problem that remains is, that I can't really see anything in it, it's wobbling all over the place, probably because you can't discretely sample coherently a continuous sound. If someone succeeds in graphing the phase response of an FFT beautifully, please let me know.This is as far as I've got: Thanks!

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