SynthModules

Did you notice the CALCRAND subroutine?

We are free running timer W at 16 MHz and then sampling the 
counter "sawtooth" in a non-sychronized fashion. That number is 
then used as the seed for the RANDOM function.

Theoreticaly, that should be closer to "true" random than a 
psuedo-random shift register of any length.

I believe it is used in the "Wigglyman" code.

You just have to setup the counter, then access the TCNT 
variable. Unfortunately, none of this is documented, but Mike and 
I puzzled it out.

--- In SynthModules@yahoogroups.com, "Woody Wall" 
<woody_wall@h...> wrote:
> --- In SynthModules@yahoogroups.com, "grantrichter2001"
> <grichter@a...> wrote:
> > Very cool application.
> 
> Thanks.
> 
> > I think Dr. Mabuse might have some tweakage for this 
> > program????
> > 
> > It seems right up his alley....
> 
> I thought he might get a kick out of it.
> 
> By the way, the RANDOM function wasn't behaving as I 
expected, so I
> lifted one out of Hal Chamberlin's "Musical Applications for
> Microprocessors." It only has a length of 4096, but I can't hear 
any
> cycling.
> 
> Woody
> 
> > --- In SynthModules@yahoogroups.com, "Woody Wall" 
> > <woody_wall@h...> wrote:
> > > I've just uploaded two programs that generate different 
noise
> > > functions. minoise.bas produces interpolated noise. This 
> > basically
> > > turns out to be a triangle LFO whose amplitude changes at 
> > each slope
> > > transition. Four outputs are provided, each twice the 
frequency 
> > of the
> > > previous one. Put a voltage in IN-1 to change the basic 
> > frequency.
> > > 
> > > perlin.bas produces Perlin noise. You may not know what 
this 
> > is, but
> > > you've surely seen it in use. Two- and three-dimensional 
Perlin 
> > noise
> > > is used in computer graphics to produce landscapes, 
clouds, 
> > smoke,
> > > fire, etc. This program produces one-dimensional noise to 
> > control
> > > filters, flangers, whatever. Higher numbered output have a 
> > greater
> > > concentration of high-frequency noise. As with minoise, the 
> > basic
> > > frequency can be voltage-conrolled at IN-1. I'm not 
completely 
> > happy
> > > with this program, as I wanted to use another input to 
> > continously
> > > vary the weighting of the frequencies. But integer arithmetic 
> > and the
> > > lack of exponentiation put that beyond my capabilities. So 
for 
> > now the
> > > relationships are fixed. Maybe someone else can improve 
this.
> > > 
> > > Enjoy.
> > > 
> > > Woody