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@... > -----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
> =
>
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>
> ------------------------------------------------------------------------
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>