Re: [sdiy] 3 Pole state-variable filters

[jhaible at debitel.net]

> > non-minimal-phase BPF filter. Ok, no need to choose the zero
> > equal to the negative real pole,

> Nope . You get bp2+ap only if zero is positive .

Sure. The real pole must be negative (for stability), and the
zero to make an AP must be "the negative of the pole"
(same absolute, opposite sign), which means positive.
I see that "negative" must have been confusing. What is the
precise Englich word? Complementary?

JH.