[sdiy] Trapezoid oscillator, was: Dual oscillator cores?

[cheater cheater]

Thanks for clearing it up Donald!

D.

On Thu, Oct 22, 2009 at 6:06 AM, Donald Tillman <don at till.com> wrote:
>   > Date: Thu, 22 Oct 2009 00:44:10 +0100
>   > From: cheater cheater <cheater00 at gmail.com>
>   >
>   > Basically as I understand it you are making it easier on yourself to
>   > do FM in your dual core oscillator by doing something similar to
>   > variation calculus (see http://en.wikipedia.org/wiki/Total_variation
>   > ): spliting your function into two similar function, one which is
>   > always either growing or constant and one which is always falling or
>   > constant.
>
> I don't see anything remotely like variation calculus going on.
>
> I think I explained it pretty well in the first of the three articles:
>   http://till.com/articles/QuadTrapVCO/discussion.html
>
> Check out the section with the colorful state diagrams.
>
>   > What exactly happens when a negative signal is routed into the FM
>   > input? Does the currently active integrator start emptying
>   > itself, or does the opposite integrator start integrating?
>
> "Emptying itself"?
>
> It just integrates in the other direction.
>
>  -- Don
>
> --
> Don Tillman
> Palo Alto, California
> don at till.com
> http://www.till.com
>