[sdiy] PSpice to VST anybody?

[Antti Huovilainen]

On Fri, 22 Apr 2005 jhaible at debitel.net wrote:

> Make a SPice small signal (AC) analysis, take the dB level
> and phase results, feed them into a VST plugin and evaluate
> filter courves by ear without breadboarding.

What do you mean by feeding the dB & phase results into a VST plugin?
The only way that'd work for a generic filter would be to use varying 
convolution and then you'd run into large cpu usage, stepping (finite 
amount of curves) and possibly patent issues.

> Anybody done this already? Anybody willing to try it?

I've done something related. Instead of recording small signal curves, I 
model the actual circuit in realtime (somewhat idealized and separated 
version).
http://dafx04.na.infn.it/WebProc/Proc/P_061.pdf  has the theory and
http://antti.smartelectronix.com/  has the results (*)

*: XPander filter is not true XPander filter, but a model of OTA based 
filter. I just called it that because it has the same 16 modes and similar 
reduced passband loss with increasing resonance.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova