[PD] Colored (fractal, 1/f^a) noise generator for PD

[Mathieu Bouchard]

On Sun, 20 Aug 2006, alberto.zin at poste.it wrote:

> You are right. BTW, I already wrote an external for gaussian noise 
> generation (it is an easy adaptation of the noise code + Box-Muller 
> transform to make it gaussian - not distributed yet because I've to 
> clean up the code, it is my first external ;-). But it did not change it 
> very much :-( In addition it seems that using noise~ is still ok to have 
> the desired slope in the spectrum...

Doesn't a Gaussian distribution have a spectrum proportional to its own 
density? That is, exp(-s^2/var)/sqrt(2*pi*var). That means that in the dB 
vs octave graph, it would appear as a quadratic instead of a straight 
line, and this doesn't match any of the examples shown in the 
Colors_of_noise article. Right?

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