[sdiy] Modeling circuits

[Dave Kendall]

FWIW, the digidesign eleven rack 
http://www.avid.com/us/products/eleven-rack has different input 
impedances for whichever pedal or amp model is first in the chain. I 
believe 4 different impedances can be selected using 
digitally-controlled resistors. Sounds interesting - a guitarist friend 
has bought one, and 2 of his (purist tendency) friends are trying it 
out.

Will be interested to see how it turns out.....

cheers,
Dave

On Oct 23, 2010, at 09:35, cheater cheater wrote:

> <semantics>
> Scott, I think you're not actually talking about component level
> modeling, just about "physical modeling" of circuits. or
> component-based modeling, I.e. you take a circuit (or large block) and
> find the (differential) equations that describe its behavior as a
> whole and then you run that using newton-raphson or something like
> that. I think component-level modeling would mean having separate
> equations for every component, including separate sources of
> self-noise, separate thermal characteristics, and possibly separate
> device features as well (because of tolerances). I think this is what
> Jason has touched upon in his email. Semantics, but I think it
> explains :-)
> </semantics>
>
> Cheers,
> D.
>
> On 23/10/2010, Jason Proctor <jason at redfish.net> wrote:
>> really? do you have a source for this information?
>>
>> i ask because of a post by Paul Schreiber a little while back which
>> describes how component level modelling isn't viable with current
>> processor technology.
>>
>> the interview with UAD in Tape Op also didn't mention this -- IIRC, 
>> that
>> is...
>>
>>
>>
>>> State of the art modeling such as Universal Audio uses, and probably
>>> line6, actually painstakingly models the electrical behavior of
>>> every circuit element (transistors resistors, tubes etc) on the
>>> original circuit board and runs that model on one or more dsp chips,
>>> which is why they need a lot of horsepower.
>>>
>>> Sent from my iPhone
>>>
>>> On Oct 22, 2010, at 8:21 AM, "Barry Klein" <barryklein at cox.net> 
>>> wrote:
>>>
>>>>  Hi,
>>>>  Just received an ad from Line6 on their "HD modeling" pedals.
>>>>  Made me wonder...  What if you had one that took your crappy old
>>>> sawtooth and made it
>>>>  a nice fat/phat Moog one....  you get the idea.  Do these types of
>>>> circuits apply different amounts
>>>>  and/or frequency eq based on the input character or are they fixed
>>>> and you get what you get?
>>>>
>>>>  Barry
>>>>
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