[sdiy] Craig Anderton's Multiple Identity Filter

[David G Dixon]

I've got a filter design called the "Polaris" that gives nearly 30 different
useful filter modes in a much simpler say than the MIF, and doesn't need a
Curtis chip to do it.  Intellijel sells it for $229.  If you want to check
it out, go here: https://intellijel.com/eurorack-modules/polaris/  It's
based on a Roland-esque cascaded-stage four-pole filter, and takes
inspiration from Grant Richter's old Oberheim Matrix multimode filter
design, but it goes a fair bit further than that.  The mode switching is
done with a microcontroller generating a 17-bit code which controls five
analog switches, which I still don't know how to do, so I don't have a
handmade version of it yet.

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] 
> On Behalf Of KA4HJH
> Sent: Wednesday, October 26, 2016 8:55 AM
> To: sdiy
> Subject: Re: [sdiy] Craig Anderton's Multiple Identity Filter
> 
> > On Oct 26, 2016, at 4:37 AM, Andrew Simper <andy at cytomic.com> wrote:
> > 
> > From what I can see with Craig Anderton's filter it won't actually 
> > give the "correct" responses for all the different filter 
> types unless 
> > there is a way to switch the polarity of the resonance, and 
> also where 
> > the resonance is added. Am I missing something? Sorry if 
> I've posted 
> > all this stuff before.
> 
> This is one of the reasons I reposted the link. I remember 
> some discussion about this and wondered how Craig's design compared.
> 
> 
> > On Oct 26, 2016, at 12:30 AM, Doug Terrebonne 
> <dougt55 at yahoo.com> wrote:
> > 
> > The MIF article has been on synthdiy.com for a long time - 
> > http://www.synthdiy.com/files/2002/MIF.pdf
> 
> I didn't even know it was there.
> 
> 
> > On Oct 26, 2016, at 5:43 AM, Roman Sowa <modular at go2.pl> wrote:
> > 
> > Why use predatory file hosting sites while there are sites 
> like synthdiy.com or synth.net, which AFAIK are managed by 
> this list members.
> 
> I completely forgot they existed but then this is the first 
> time I've received a complaint about Mediafire.
> 
> 
> > On Oct 26, 2016, at 5:43 AM, Roman Sowa <modular at go2.pl> wrote:
> > 
> > Why use predatory file hosting sites while there are sites 
> like synthdiy.com or synth.net, which AFAIK are managed by 
> this list members.
> > 
> > If anyone's interested I can also host any doc files (no 
> audio/video/warez or any pirated stuff) at regular downolad 
> links, no ads, no download buttons or popups.
> 
> 
> Good to know. I may take you up on it.
> 
> 
> Terry Bowman, KA4HJH
> "The Mac Doctor"
> 
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