[sdiy] Using analog for physical modeling

[David Ingebretsen]

OK,

This one? It has schematics, talks about a MN3207 BBD, etc.

http://www.electro-music.com/forum/viewtopic.php?highlight=karplus+bbd&t=419
76


David

>>> -----Original Message-----
>>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>>> bounces at dropmix.xs4all.nl] On Behalf Of Scott Gravenhorst
>>> Sent: Sunday, September 18, 2011 2:10 PM
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: Re: [sdiy] Using analog for physical modeling
>>> 
>>> "David Ingebretsen" <dingebre at 3dphysics.net> wrote:
>>> >
>>> >
>>> >>>> -----Original Message-----
>>> >>>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>>> >>>> bounces at dropmix.xs4all.nl] On Behalf Of Scott Gravenhorst
>>> >>>> Sent: Sunday, September 18, 2011 1:41 PM
>>> >>>> To: synth-diy at dropmix.xs4all.nl
>>> >>>> Subject: Re: [sdiy] Using analog for physical modeling
>>> >>>>
>>> >>>> A friend (Les Hall aka Inventor) on the electro-music.com forum
came up
>>> >with
>>> >>>> something I thought was interesting.  He re-modeled a
Karplus-Strong
>>> >string
>>> >>>> model
>>> >>>> using analog components (assuming you consider a BBD an analog
device).
>>> >>>>
>>> >>>> His loop was constructed with a BBD (length, I don't know), a
linear
>>> >>>> attenuator
>>> >>>> (pot) and a tunable single pole lowpass filter (one LM13700).  He
drove
>>> >the
>>> >>>> BBD
>>> >>>> clock with a VCO to allow tuning the delay line.  I wish I could
find
>>> >the
>>> >>>> post on
>>> >>>> e-m, but my fu isn't so fu.
>>> >>>>
>>> >>>> -- ScottG
>>> >
>>> >Is this the thread?
>>> >
>>> >http://electro-
>>> music.com/forum/viewtopic.php?highlight=model+karplus&t=40927
>>> 
>>> No, that one uses ChucK which is a computer language and sound
generation
>>> system and is
>>> wholly digital.
>>> 
>>> There was/is a thread about "The Brick" which is his BBD Karplus-Strong
>>> design with a
>>> sequencer added.  There isn't any good detail there about the K-S loop.
>>> 
>>> There is a thread somewhere there that describes in detail (including
>>> schematics I
>>> believe) just the Karplus-Strong loop, but I can't seem to locate it.
>>> 
>>> 
>>> 
>>> >
>>> >David M. Ingebretsen, M.S., M.E.
>>> >Collision Forensics & Engineering, Inc.
>>> >
>>> >Office: 801 733 5458
>>> >Cell: 801 842 5451
>>> >
>>> >www.CFandE.com
>>> >dingebre at CFandE.com
>>> >dingebre at 3dphysics.net
>>> >
>>> >
>>> >
>>> >
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>>> >
>>> 
>>> -- ScottG
>>> ________________________________________________________________________
>>> -- Scott Gravenhorst
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