[sdiy] VC Chaos

[Ian Fritz]

At 03:04 PM 11/28/2004, ASSI wrote:

>Based on my limited experience with Chua type circuits from long ago I
>believe that non-autonomous systems may have greater utility for
>musical purposes. After all the chaos occuring naturally in real
>instruments is always (always means I know no counterexample - how's
>that for a proof? ;-) in response to an external force. One of my ideas
>is to keep the oscillator tonal by almost, but not quite injection
>locking it. Sort of like an harmonic stick-slip. Even for pure control
>voltages or noise you might not want to have complete chaos, but some
>recognizable pattern. In other words some autocorrelation with a
>controllable length would be desirable.

Agreed, for audio freqs.  I believe what you are suggesting is trying to 
find the "right" kind of "noise" as found in acoustic instruments.  Pretty 
much an unexplored area.

I have been more interested in slow control signals and pulse trains, which 
is what the demos involve.

>... Both structures have
>potential for some serious circuit bending, even if you'd probably lose
>the ability to analyze them very soon.

Yes, I have to admit doing some of that myself.  :-)

> > I like his idea of using cascaded integrators, because you can think
> > of the three outputs as a signal and its two successive derivatives.
>
>I guess you could just use that structure and inject a pulse train some
>strategic place as well.

Yes, that works.

>Speaking of which - how big are the MP3's? My modem is still recovering
>from the download of the page itself (I know, I should get DSL).

Sorry about that.  Unfortunately, you need quite high resolution to get a 
good picture, and lots of pictures to even start to illustrate the variety 
of patterns you can get.  The MP3s are 709, 362, 225, and 268 KB.

   Ian