On 07/19, Oliver Larkin via Faudiostream-users wrote: > > Based on the pseudo code in this paper: > > http://www.cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf > <http://www.cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf>
This pseudo code is very clear, so I think the faust implementation is very simple ... See the untested code below. The only problem is that copy-and-paste doesn't work, perhaps I did some mistakes. Oleg. ------------------------------------------------------------------------------- import("stdfaust.lib"); svf(T,F,Q,G) = tick ~ (_,_) : !,!,_,_,_ : si.dot(3, mix) with { a1 = 1/(1 + g*(g + k)); a2 = g*a1; a3 = g*a2; tick(ic1eq, ic2eq, v0) = 2*v1 - ic1eq, 2*v2 - ic2eq, v0, v1, v2 with { v3 = v0 - ic2eq; v1 = a1*ic1eq + a2*v3; v2 = ic2eq + a2*ic1eq + a3*v3; }; A = pow(10.0, G / 40.0); g = tan(F * ma.PI / ma.SR) : case { (7) => /(sqrt(A)); (8) => *(sqrt(A)); (t) => _; } (T); k = case { (6) => 1/(Q*A); (t) => 1/Q; } (T); mix = case { (0) => 0, 0, 1; (1) => 0, 1, 0; (2) => 1, -k, -1; (3) => 1, -k, 0; (4) => 1, -k, -2; (5) => 1, -2*k, 0; (6) => 1, k*(A*A - 1), 0; (7) => 1, k*(A-1), A*A - 1; (8) => A*A, k*(1-A)*A, 1-A*A; } (T); }; lp(f,q) = svf(0, f,q,0); bp(f,q) = svf(1, f,q,0); hp(f,q) = svf(2, f,q,0); notch(f,q) = svf(3, f,q,0); peak(f,q) = svf(4, f,q,0); ap(f,q) = svf(5, f,q,0); bell(f,q,g) = svf(6, f,q,g); ls(f,q,g) = svf(7, f,q,g); hs(f,q,g) = svf(8, f,q,g); ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Faudiostream-users mailing list Faudiostream-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/faudiostream-users