[sdiy] Using analog for physical modeling

[Scott Gravenhorst]

"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
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-- Scott Gravenhorst
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