Hello, I've been using the filter abstractions from the rjlib, which are all vanilla. Also, they use a an abstraction variant of [biquad~] called [e_beequad] that allows for signal control instead of message. The equations used are also nicely documented within the patches.
http://trac.rjdj.me/browser/trunk/rjlib/rj
.mmb
On Sun, May 17, 2009 at 9:03 AM, brandon zeeb zeeb.brandon@gmail.comwrote:
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@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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