[PD] basic resonant filters in Pd

[Derek Holzer]

I think if you Google "biquad filter coefficients" or similar, you'll 
come up with tons of Greek to play with. Otherwise, the GGEE objects 
merely do the calculations and export them as messages, so if you wanted 
to use these objects to get some reasonable sounding stuff and then 
build your vanilla filters based on those coefficients, the filters 
themselves are technically vanilla as well.

best!
D.

brandon zeeb wrote:
> 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 
> <mailto: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"
> 
> 

-- 
::: derek holzer ::: http://blog.myspace.com/macumbista ::: 
http://www.vimeo.com/macumbista :::
---Oblique Strategy # 76:
"Give the game away"