On 05/28, Till Bovermann wrote:
>
> I was thinking to use the fi.svf.lp filter as a building block instead
> but it is (AFAICS, it is not mentioned in the doc string...) not a 1st
> order design (which is crucial here, partly for consistency with the to
> be emulated analog circuitry, partly because the phase shift should be
> consistent to be able to deal with the resonance feedback).
Yes, fi.svf is 2nd order. You can this 1nd order filter:
lp(fc) = tick ~ _ : !,_ with {
g = tan(fc * ma.PI/ma.SR);
tick(ic1eq, v0) = 2*v1 - ic1eq, v1
with { v1 = (g * v0 + ic1eq) / (1 + g); };
};
it has the same impulse response as fi.lowpass(1, fc) when fc is constant,
but probably differs when fc is modulated.
Oleg.
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