[PD] can [bp~] be obtained with biquad coefficients?

Colet Patrice colet.patrice at free.fr
Wed Apr 9 13:30:02 CEST 2014

Le 09/04/2014 01:45, Alexandre Torres Porres a écrit :
> Hi there. I'm trying to find a way to plot the frequency response 
> of [bp~].

Hello, I don't know if it helps, in ggee there are filter objects that 
are applying formula for biquad coefficients, it's easy to use those 
formula in expr and apply them to biquad object in vanilla.
> I know of patches that can plot from biquad coefficients, so it'd be 
> great if I could get biquad coefficients from an input of frequency and Q.
> I see [bp~] is a 2 pole filter. So does it mean I can achieve it by 
> zeroing out a bandpass filter made with [biquad~]? Cause I see people 
> make bandpass filters with 2poles in biquad, but the zeros are at -1 
> and 1. I tried zero values of zero, but it didn't look to good to make 
> me believe that's the same as [bp~].
> I know of miller's example H10.measurement.pd, and compared to it, 
> didn't seem to fit.
> Anyway, I wanted something that would plot [bp~] right away, not like 
> the H10 example, which takes some time. But then, if we can't do it 
> with biquad coefficients, I would need some guidelines to do it some 
> other how.
> Thanks
> Cheers
> I know about filterview and patch
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