[sdiy] Moog filter self-FM questions

[Neil Johnson]

Hi,

Antti Huovilainen wrote:

> On Sun, 28 Mar 2010, cheater cheater wrote:
>
>> Simon,
>> thanks a lot for your email. Unfortunately some more explanation will
>> be necessary, I'm not smart enough yet to understand what you  
>> mean :-)
>> Some questions below..
>
> Read my paper on the non-linear digital emulation. It explains how  
> the ladder filter works for large signals.
>
> There is no self-fm, only nonlinearity within each of the 4 stages  
> (yes, there are only 4 stages, not 8).

And Tim's paper makes an excellent introduction to the topic:

    http://www.timstinchcombe.co.uk/synth/synth_main.html#moog_paper

There are also some fun animations of filter poles moving around the  
s-plane:

    http://www.timstinchcombe.co.uk/synth/poles/poles.html

(Note: I misspelled Tim's surname in an earlier email - sorry Tim!)

Neil
--
http://www.njohnson.co.uk