[sdiy] Using analog for physical modeling

[Scott Gravenhorst]

Here it is:

http://www.electro-music.com/forum/topic-36165.html&postorder=asc



"David Ingebretsen" <dingebre at 3dphysics.net> wrote:
>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
>>>> -- FPGA MIDI Synthesizer Information:
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>>>> 
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>
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-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- FPGA MIDI Synthesizer Information: 
   jovianpyx.dyndns.org:8080/public/FPGA_synth/
-- FatMan: 
   jovianpyx.dyndns.org:8080/public/fatman/
-- NonFatMan: 
   jovianpyx.dyndns.org:8080/public/electronics/
-- When the going gets tough, the tough use the command line.