[PD] [bp~] really equal to [vcf~]?

[Alexandre Torres Porres]

> it's accurate to say that [biquad~] is a real-valued 2-pole/2-zero filter.

but why, if the poles and zeros can have complex values?


2014-07-25 8:18 GMT-03:00 IOhannes m zmölnig <zmoelnig at iem.at>:

> On 07/24/2014 10:14 PM, Alexandre Torres Porres wrote:
> >> vcf~ isn't a 2-pole real filter but a 1-pole complex one
> >
> > kinda relative to this, since biquad~ can be emulated with 2 complex
> poles
> > + 2 complex zeros
>
> it can not only be emulated, it can be implemented with a complex
> 2-pole/2-zero filter.
>
> > , is it more accurate to say biquad is a
> > 2-complex_pole-2-complex_zero-filter???
> >
>
> no.
> it's accurate to say that [biquad~] is a real-valued 2-pole/2-zero filter.
>
> real values are a subset of complex values (with the imaginary part set
> to 0).
>
> > In its description it says it is a 2-pole-2-zero-filter...
>
> which is true.
>
> gfmasdr
> IOhannes
>
>
>
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