[sdiy] Akai S612 filter/schematics

[Andre Majorel]

On 2002-04-18 00:59 -0700, Ethan Duni wrote:

> > The frequencies of the partials were set by raising a number to
> > a random power. I think this is a pink distribution (i.e.
> > statistically, each octave contains as many partials as any
> > other octave).
> 
> -Interesting.. what is the distribution of the power that you raise the
> number to?

It was a normal, linear RNG. The formula was something like 

  double random    = (double) rand () / RAND_MAX;
  double frequency = pow (someconstant, random);

> > White noise does *not* look flat in a spectrum analyser, as each
> > octave has twice as much energy as the octave below.
> 
> -Depends on whether your spectrum analyzer is plotting on a linear or log
> scale, no?

Yes. If it plots amplitude versus frequency, it will be flat. If
it plots amplitude versus log of frequency it will rise. I assume
that spectrum analysers designed for audio use a logarithmic scale
for frequency.

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
std::disclaimer ("Not speaking for my employer");