[PD] basic resonant filters in Pd

brandon zeeb zeeb.brandon at gmail.com
Sun May 17 15:03:50 CEST 2009


Derek,

Thanks for the complete list!  This is very helpful.

I was hoping to start off by using Vanilla-only objects.  Does anyone have
some good examples of how [biquad~] can be used to replicate standard
low/high/band pass filters w/ q?  Any other ideas?

~brandon

On Sun, May 17, 2009 at 4:35 AM, Derek Holzer <derek at umatic.nl> wrote:

> Hi Brandon,
>
> here ya go!
>
> VANILLA PD
>
> *SIGNAL CONTROLLED*
>
> vcf~
> moog~
>
> *MESSAGE CONTROLLED*
>
> lop~
> bp~
> hp~
> biquad
>
> PD-EXTENDED/EXTERNAL LIBRARIES
>
> *SIGNAL CONTROLLED*
>
> ---IEM Lib filters---
>
> vcf_filter~ (building block for following abstractions)
>
> vcf_bp2~
> vcf_bp4~
> vcf_bp6~
> vcf_bp8~
>
> vcf_hp2~
> vcf_hp4~
> vcf_hp6~
> vcf_hp8~
>
> vcf_lp2~
> vcf_lp4~
> vcf_lp6~
> vcf_lp8~
>
> vcf_rbp2~
> vcf_rbp4~
> vcf_rbp6~
> vcf_rbp8~
>
> *MESSAGE CONTROLLED*
>
> ---IEM Lib filters---
>
> filter~ (building block for following abstractions)
>
> bpq2~
> bpw2~
> bsq2~
>
> hp1~
> hp2~
> hp2_bess~ (can go from 2-10 order)
> hp2_butt~  (can go from 2-10 order)
> hp2_cheb~  (can go from 2-10 order)
> hp2_crit~  (can go from 2-10 order)
>
> lp1~
> lp2~
> lp2_bess~  (can go from 2-10 order)
> lp2_butt~  (can go from 2-10 order)
> lp2_cheb~  (can go from 2-10 order)
> lp2_crit~  (can go from 2-10 order)
>
> ---GGEE---
>
> (Generate biquad coefficients)
> bandpass
> highpass
> lowpass
>
> Maybe I missed some? ;-)
>
> Best!
> D.
>
>
>
> brandon zeeb wrote:
>
>> Hallo,
>>
>> How does everyone implement basic resonant filters, ie: LPF, HPF, BPF, in
>> Puredata?  [lop~], [hip~], and [bp~] are nice, and can easily be strung
>> serially to create 2nd, 3rd, and 4th order filters, but lack q.
>>
>> [biquad~] seems up to the task, but I'm unable to find any information in
>> the help file or docs online pertaining to how one could replicate standard
>> filters using this object.
>>
>
> --
> ::: derek holzer ::: http://blog.myspace.com/macumbista :::
> http://www.vimeo.com/macumbista :::
> ---Oblique Strategy # 164:
> "Twist the spine"
>
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