[sdiy] Analog Modeling, with a computer!

[Bill K]

Er. Cool idea.  But could you imagine if Half-Life et. al.  used true 
physics simulation just to make the game "real"?  While cool, at this point 
the math would bog the game to helen back. And the point there is to make it 
fast enough for "real" play where you don't notice the heavy object falling 
faster than the light object.  It seems like you'd want to have a car racing 
game and be able to specify the type of rubber that goes into the tires.  
Overkill, I'd say. But COOL! (build my 400 horsepower engine out of ceramic 
and see if it holds up....?)

No, IMHO modelling is just that: i.e  How cheaply can you code a band pass 
filter that sounds as close as possible, but operates in real time. And 
while modelling circuits is cool, I think the usefulness of that is "hey I 
designed it with a TL072, lets see how crappy it gets with a mA709...."  But 
I guess that's simulation.  Now in 5 to 7 years, I think that your idea 
would be approaching the point of usability for real-time use and/or 
performance.  I'd certainly like to move down to that level without burning 
solder holes in my pants ;o)  Oh


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>From: Jeff Farr <moogah at gmail.com>
>Reply-To: moogah at gmail.com
>To: synth-diy <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] Analog Modeling, with a computer!
>Date: Wed, 14 Sep 2005 13:32:30 -0400
>
>Ok, so I have a secret... The whole reason I'm learning how to make
>electronic instruments is beacuse I wish to understand the concepts used to
>make component modeled VA synths akin to Arturia's product line. Now, I am
>familiar with 'standard' physical modelling, phase-delays, point masses,
>etc. However, I have yet to make the jump from this to modeling an
>electronic component, further, it seems this is still very much black 
>magic,
>in my discussions with those at Yamaha, Wine County and a few others the
>conversation comes to a complete halt when I ask about how their analog
>modelling works. Not even a "compass pointer" on where to look in order to
>teach myself. So far, in a year or searching I have found nothing about
>modelling electronic components in a library, the internet, or someone 
>elses
>brain (at least not in a brain that was willing to share). SO, how 'bout it
>SDIY? does anybody have a light they can shine on the type of algo needed 
>to
>act like a tl072, 3080, elko cap? I've begun looking into SPICE, as it
>dawned upon me that a current simulator is actually very close to what I'm
>looking for, however, it is also clear that there must be optimizations to
>the algos to make this work in real time, and to truely capture the sound 
>of
>these old analog circuits...