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View Code? Open in Web Editor NEWMiller Puckette's Moog filter emulator [bob~] compiled for windows
Miller Puckette's Moog filter emulator [bob~] compiled for windows
***This code is entirely by Miller Puckette with the exception of a few modifications to the file makefile.include. The reason for this hosting is to have a copy of the extern that is compiled for windows.*** The bob~ object. BSD licensed; Copyright notice is in bob~ source code. Imitates a Moog resonant filter by Runge-Kutte numerical integration of a differential equation approximately describing the dynamics of the circuit. Useful references: Tim Stilson Analyzing the Moog VCF with Considerations for Digital Implementation https://ccrma.stanford.edu/~stilti/papers/moogvcf.ps.gz (sections 1 and 2 are a reasonably good introduction but the model they use is highly idealized.) Timothy E. Stinchcombe Analysis of the Moog Transistor Ladder and Derivative Filters (long, but a very thorough description of how the filter works including its nonlinearities) Antti Huovilainen Non-linear digital implementation of the moog ladder filter (comes close to giving a differential equation for a reasonably realistic model of the filter). Th differential equations are: y1' = k * (S(x - r * y4) - S(y1)) y2' = k * (S(y1) - S(y2)) y3' = k * (S(y2) - S(y3)) y4' = k * (S(y3) - S(y4)) where k controls the cutoff frequency, r is feedback (<= 4 for stability), and S(x) is a saturation function.
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