[sdiy] Analog Modeling, with a computer!

[Harry Bissell Jr]

--- Antti Huovilainen <ajhuovil at cc.hut.fi> wrote:


> This is a mistake "newbies" often make. Modelling
> individual components 
> does not make sense. Instead you need to identify
> the relevant 
> non-idealities and model the whole circuit such that
> it matches those. A 
> capacitor alone does not do anything. However once
> you connect two 
> resistors and diodes to the capacitor, you have an
> AD envelope generator 
> and can model that (typically modelling attack and
> decay stages 
> separately).


I'd disagree (in part). Modeling a capacitor or
resistor is unlikely to result in any change in
sound..unless that component was AWFUL  (the parasitic
elements are very large).

Modeling the semiconductors WOULD make a large
difference and a better model would be noticible.
Simple models give simple results, and don't include
the small changes that might make a circuit sound
different.

You could (in theory) run a spice simulation and
output the data to a .wav file and listen to it. You
might be better off playing with a synthesizer and
comparing the sim results and the real circuit
visually. 

This will not tell you what you 'hear'.

I have seen some interesting results in spice that
didn't sound good when built, and some that look
boring on screen that sound very good.

I cannot imagine anyone running spice in real time,
however.

H^) harry