[sdiy] Ms20 filter clone PBC?

[Magnus Danielson]

From: Aaron Lanterman <lanterma at ece.gatech.edu>
Subject: Re: [sdiy] Ms20 filter clone PBC?
Date: Wed, 27 Feb 2008 16:49:46 -0500
Message-ID: <BF936656-9AC7-40AD-9978-F16E24A92453 at ece.gatech.edu>

> 
> On Feb 27, 2008, at 3:11 PM, JH. wrote:
> 
> >> I remember coming up with similar conclusions, that the HP is actually
> >> more of a one pole.
> >
> > No, it's still a 2-pole HPF, even though it's 6dB/Oct in HPF mode.
> > Must be a zero exactly compensating one of the (real) poles (as long as no
> > feedback is applied).
> > But with feedback applied, the poles become complex, and you get resonance.
> 
> This is now ringing a bell.
> 
> Is the transfer function something like this?
> 
> a s^2 + b s
> ------------------
> c s^2 + d s + e

Yeah... seems reasnoble... you could even have a non-s multiple coeffcient
there... just not major.

But you are on the right track...

> - Aaron, still looking for his notes

Why? You've got Synth-DIY at your disposal! ;)

Cheers,
Magnus