Absolutely fascinating stuff and something that I’ve never been able to pursue. A cogent, practical, paper with a similar goal set is here. Do let us know how you get on!
https://www.researchgate.net/publication/344160057_A_Comparison_of_Virtual_Analog_Modelling_Techniques_for_Desktop_and_Embedded_Implementations Sent from my iPad > On 29 Nov 2023, at 10:12, STEFFAN DIEDRICHSEN > <0000009333a9e91c-dmarc-requ...@lists.columbia.edu> wrote: > > WDF would be one way, nodal analysis or modified nodal analysis another one. > > However, in this case you should be able with help of a software, which deals > well with symbolic math, to figure out the transfer function by “reducing” > this circuit to a complex voltage divider. Just by fusing together parallel > and serial resistances and applying a series of star-delta-transformation or > delta start transformation. In the end, you have two super complex resistors, > which represents the circuit as a voltage divider. Then you apply a bilinear > transform, ending up with a 5th order all real pole filter. Plus some zeroes. > > For hardware, you can use then star delta transformation only for elements of > the same kind, but for circuit analysis, this doesn’t apply, you just get > complex elements. > I did that for the Fender tone stack and it turned out quite well. > > Best, > > Steffan > >> On Nov 29, 2023, at 09:09, Jens Johansson <jmobile...@gmail.com> wrote: >> >> Been lurking for 20+ years off and on :D >> >> I would finally like to ask for some advice. I have this idea to simulate a >> guitar stomp box (a Morley JD-10). Most of the filters are simple RC type >> circuits which I think (hope) that I can figure out by analyzing, farting >> around in LTSpice, and then using some of the formulas from the Audio EQ >> Cookbook. >> >> However, there is an EQ section which doesn't quite fit into those molds. Or >> does it? >> >> What would the esteemed mailing list's advice be, is it even possible to >> analyze and simulate the below circuit just with simple(r) feed-forward and >> feedback algorithms, or is it so complex that I would have to take the step >> how to learn to deal with those "Wave Digital Filters"? >> >> Cheers, >> Jens >> <Screenshot - 11_29_2023 , 6_37_59 AM.png>
