new here plus a question...

[Happy Harry]

Hi Bram:

They are just filters... and fairly simple ones. There is
a thread going on at the same time about very complex and
subtle processes that happen in these filters. So there is some
cross-talk here.

The "tone controls" in the Duncan application are typical of guitar
amps.  If you model them, you will have a first-order approximation
of how they "sound".

But most of us think that there is still something missing from the
model. Maybe parasitic components of the circuit, or non-linear
processes that are or are NOT obvious.

The other thread was "Why does the Moog Ladder filter have some
quality that does not allow it to be modeled exactly" This is probably
way beyond what you are trying to get to right now.

In fact... no one here understands it either... that's why the talk
is going on...

H^) harry


>From: Bram de Jong <Bram.DeJong at rug.ac.be>
>CC: synthDIY <synth-diy at node12b53.a2000.nl>
>Subject: Re: new here plus a question...
>Date: Thu, 18 Jan 2001 16:50:59 +0100 (MET)
>
>On Thu, 18 Jan 2001, Jim Patchell wrote:
> > > Andy and me have been pondering about specialised methods that could 
>model
> > > these frequency curves in the digital domain using weird non-linear 
>stuff
> > > like genetic algorithms, but then I'd need the transfer functions 
>again :)
> >
> >     I would suggest using DSP's such as 12ax7's, 6L6's and the such.  
>These
> > devices can process audio in real time, plus they have the algorithms 
>built
> > right into them that you require. :-)
>
>Oh, but I'm not looking into hardware. I'm a software only kinda guy :)
>
> >     But seriously, modeling the non-linear characteristics of all of the
> > devices in an amplifier seems like an awful big job.  Of course, maybe I 
>don't
> > understand the question.
>
>Dammit! Lol!
>I think I didn't really pose my question the right way :))
>What **are** these schematics?? Am I so wrong in thinking that they only
>model filters? Everyone starts talking about nonlinearities, and here I
>was thinking these were filters :)
>
>
>cheers,
>
>Bram (a bit confused now)
>

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