[sdiy] S-plane visualization software

[Magnus Danielson]

From: Grant Richter <grichter at asapnet.net>
Subject: [sdiy] S-plane visualization software
Date: Sat, 23 Feb 2002 08:51:23 -0600

> Hello All,

Hi Grant,

> It seems that computers should be helpful for continuous time (s-plane)
> filter design.
> 
> IS THERE a piece of software where you can move poles and zeros around and
> see the effect on the real axis???????

Possibly one of those filter design softwares out there.

> Then ideally chuck out the transfer function indicated by the pole zero
> setup......

Which is really a very simple computation to do.

You could plot (all with fairly simple computation) amplitude
responce, phase responce, phase delay responce, group delay responce
straigth out of the pole and zeros.

> After years of wrestling mentally with this gymnastics, it occurs to me MY
> COMPUTER could maybe be some help???????

Indeed. Let the computers do what they excell at, crunching alot of
booring numbers.

> How about it, any decent, visually oriented, S-plane software out there?????

I don't know of one to use, but it should be a simple thing to do
however.

I think a good place to ask is the gEDA developer's list at
geda-dev at seul.org. You can get pretty good answers there at times. Try it!
You can allways check out the gEDA webpages to see what's there:
http://www.geda.seul.org/

There are alot of small and big associated tools around. I don't
recall what happened to the Smith-chart one, but there used to be one
of those too. I haven't tested all tools, so there migth be one out
there doing it.

> Looking for my Laplace in the World.....;^)

Ai'nt we all?

Cheers,
Magnus