I want to do fft~ of a file named a.wav.
so when i read a file and attach it to fft~ object. it says fft~ inlet expected signal not a file.

I undersatnd the error , that fft need signal inlet , not the file.

so how I can do the fft~ of a wave file. I want to do the fft of a wav file (stored at disk) and then want to store the imaginary part in an array.

I guess you've got to load the file into an array via the [soundfiler] and play it, or stream the wave file via the [readsf~] object.

I opened file by using read, and set the "source" as an array.

read source
|
soundfiler
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atom

bang
|
tabplay
|
fft~
|
tabwrite img

but I could not get the imaginary part of fft.

pls see the attched file for details.

Objective: My objective is to load a sound file and do fft and store the imaginary part in 512 array.

thanks.

http://www.pdpatchrepo.info/hurleur/fft.pd

i think you might rather record to disk the imaginary portion of the transformed sound using [writesf~] and then open it into an array using [soundfiler]. You shouldn't discard the real portion though, if you want to ifft~ at any point. the fft~ produces a complex signal, that is to say that the real and imaginary portions are entwined.

<<i think you might rather record to disk the imaginary portion of the transformed sound using [writesf~] and then open it into an array using [soundfiler].>>

Actually the recorded voice is done by some other program. (may be window recorder, so I dont have a choice to store only transformed portion. what i have, I have a recorded wave sound)

<<You shouldn't discard the real portion though, if you want to ifft~ at any point. the fft~ produces a complex signal, that is to say that the real and imaginary portions are entwined.>>

Yes you are right. I would not discard it in the actual program.