[sdiy] Analog Computers ( again )

David G. Dixon dixon at interchange.ubc.ca
Wed Feb 11 03:30:13 CET 2009


Cool.  I'll have to watch it sometime.  (I've watched a few of your other
lectures and found them pretty informative -- the one on expo converters
really opened my eyes!)


David G. Dixon
Department of Materials Engineering
University of British Columbia
309-6350 Stores Road
Vancouver, B.C. V6T 1Z4
Tel 1-604-822-3679
Fax 1-604-822-3619
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> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> bounces at dropmix.xs4all.nl] On Behalf Of Aaron Lanterman
> Sent: Tuesday, February 10, 2009 2:52 PM
> To: Synth DIY
> Subject: Re: [sdiy] Analog Computers ( again )
> On Feb 9, 2009, at 9:22 PM, David G. Dixon wrote:
> >> From what I understand, the state-variable filter we use in synths
> >> is also
> > an analog computer for the general mass-spring-damper second-order
> > differential equation problem from Newtonian physics.  Voltages
> > representing
> > displacement, velocity and acceleration are tapped off from various
> > points
> > within the filter circuit.  It's all very easy to do with Laplace
> > transforms
> > (apparently).
> I do a lecture on this in my Electronics for Music Synthesis class):
> http://blip.tv/file/777499 (about half an hour in)
> Also see here:
> http://web.mit.edu/2.161/www/Handouts/LPOpAmp.pdf
> - Aaron
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