Re: Filters (was Re: Test )
1999-02-18 by Dave Bradley
Paul and Hugo, I've got an applications document from the SSM catalog circa 1979 that described a 4 pole state variable with 2 resonant peaks. They were controlled separately - one was named 'Q' as normal and they called the other one 'R' or something like that. I don't believe the design was SSM specific. I've always been intrigued by this design but never got around to trying it. It sounds quite similair to Hugo's description. Anyone want a copy of the article? Dave Bradley Principal Software Engineer Engineering Animation, Inc. daveb@...
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> -----Original Message----- > From: Paul Schreiber [mailto:synth1@...] > Sent: Thursday, February 18, 1999 12:37 AM > To: motm@onelist.com > Subject: [motm] Re: Test > > > From: "Paul Schreiber" <synth1@...> > > Is this the old Curtis applications document? I have the (only) 2 issues > around somewhere. > > Actually, I'm first going to offer a Korg PS-3100 type that uses > Vactrols as > the > control element. This is the Jean-Michael Jarre effect. > > I love filters! Pathetic Moog modulars had only 2 to choose from. The > "Variable > Filter Bank" is about as exciting as a $79 Rane EQ. > > I also want to do a vocal formant filter bank. These were > well-documented in > the > early '70s, but were "un-buildable" because 1% resistors and 1% capacitors > were > soo expensive, and the op amps had insufficient GB products for > high Q (>75, > say) > and not move the Fc around. > > Paul S. > > -----Original Message----- > From: Hugo Haesaert <hugo.haesaert@...> > To: motm@onelist.com <motm@onelist.com> > Date: Thursday, February 18, 1999 12:27 AM > Subject: [motm] Re: Test > > > From: "Hugo Haesaert" <hugo.haesaert@...> > > Hi Paul n All ! > > On another bandpass note : I'm very intrigued about the variable > bandpass described in the Synthesource newsletter . Variable > bandwith, variable centerfreq, and two vc resonance peaks ... hmm . > > Would that be part of your line of thinking ? > > Take care . > > > Keep 'em oscillating :) > > > Hugo > = > > ------------------------------------------------------------------------ > Have you seen our new web site? http://www.onelist.com > > > > ------------------------------------------------------------------------ > Ta Da! See our new web site. http://www.onelist.com >