[sdiy] New shade pink noise (waveform partials)

[Richie Burnett]

Hi Tom,

I've attached a ZIP containing examples of all of the "partial" waveforms 
from the many noise sources running at the different speeds that ultimately 
get summed together to make the pink noise.  Hopefully you can see how the 
noise sources that are running at half-rate, quarter-rate, etc, are linearly 
interpolated up to the full rate.  This makes each noise source output a 
kind of piecewise linear noise waveform that ramps smoothly back and forth 
between +1 and -1, rather than changing abruptly with a step.  This makes 
the typical sinc-shaped spectral profile roll off faster, so all of the 
minor lobes of the sinc-shaped spectrum of the lower speed noise sources 
don't contribute as much and generate as much ripple when they're all summed 
together in the final spectrum.

I hope this helps.  Also hope I don't get a wrist slap for sending a ZIP to 
the mailing list (>.<)  It was a small one at least :-)

-Richie, 


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