Described in this paper: https://vicanek.de/articles/QuadOsc.pdf.
If I'm not wrong, it's not in the oscillators library yet so it could be a
good addition.
Cheers,
Dario
import("stdfaust.lib");
quad_osc(f) = tick ~ (_ , _)
with {
init = 1-1';
w = 2*ma.PI*f/ma.SR;
k1 = tan(.5*w);
k2 = 2*k1/(1+k1*k1);
tick(u, v) = omega-k1*(v+k2*omega) , v+k2*omega
with {
omega = (u+init)-k1*v;
};
};
process = quad_osc(1000);
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