[sdiy] Truly red noise

[allenre at umich.edu]

> Also, we have shot-noise, wich has even worse degree (I don't recall now if
> it
> was 1/f^3 or 1/f^4). I think "brown noise" sometimes have been used to
> describe
> shot-noise.

This is what I was referring to as "infrared" noise, in keeping with the light
analogy (poor as it may be).

> > However the distribution of  frequency density across the spectrum also can
> > make a quite notable difference.
>
> I'm loosing you here...
>
> > Even when the power spectrum is correct, the sound can be quite different
> > from what is expected.
> > But never really came across a mention of this frequency distribution
> > effect, why?
>
> Can you try to explain what you mean by frequency distribution as distinct
> from the power-spectra? The power-spectra "slope" listing gives you the
> frequency distribution, i.e. the amount of power and how it depends on the
> frequency.
>
> > The effect is most pronounced when the frequency density is relatively low.
> > I came across this when cooking up the noise oscillators for a soft synth
> > that used narrow noise bands instead of sines for additive synthesis.
> > Past tense, cause it ran on Atari ST and results where not too interesting.
> > The produced sounds really needed a chorus to live up.
>
> I think you still need to articulate yourself.

I think by density he would be referring to the number of discrete frequencies
represented.  For instance, if we had a resolution of 1Hz as opposed to 5Hz for
the different frequencies, this would produce different effects.

Ryan