[Pd] Complex audio signals

[Mathieu Bouchard]

On Wed, 14 Jun 2006, Chuckk Hubbard wrote:

> I mean that the reconstituted sound is not exactly the same as the
> original signal.

after a [fft~], a [ifft~], and then dividing by the block size, what's 
different from the original? prolly just arithmetic error from addition 
and multiplication.

BTW, if you look at relative errors on individual bins you are not looking 
at the right thing. Your relative error should be computed relative to the 
magnitude of the whole sound. If you have a case where you really need to 
have low individual relative errors, then you might have a point, but I 
wonder, do you have such a case?

a pair of FFT on a block size of 1024 is supposed to be roughly like 20 
layers each containing 2 [+~], 3 [*~] and 2 [z~], arranged in a rather 
regular pattern.

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| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada