Re: [PD] basic resonant filters in Pd

I've verified my calculations and duplicated the ggee code in a short perl script. My script and my Pd patch match, but are still off from ggee. I feel like a noob here, what's the difference? The script/patch are being compared at 100hz, bw=1, sr=48000. ~Brandon On Sun, May 17, 2009 at 9:45

Re: [PD] basic resonant filters in Pd

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~

Re: [PD] basic resonant filters in Pd

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

Re: [PD] basic resonant filters in Pd

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.

Re: [PD] basic resonant filters in Pd

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

Re: [PD] basic resonant filters in Pd

Good call! I explored the GGEE objects in Pd-extended, which led me to their source code (A+ for readability), which led me to this: http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt Thanks for the pointer. Cheers! ~Brandon On Sun, May 17, 2009 at 9:53 AM, Derek Holzer de...@umatic.nl

Re: [PD] basic resonant filters in Pd

Yeah, that's the one I was thinking of, but was too busy doing taxes to remember the name ;-) best! D. brandon zeeb wrote: http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt -- ::: derek holzer ::: http://blog.myspace.com/macumbista ::: http://www.vimeo.com/macumbista ::: ---Oblique

Re: [PD] basic resonant filters in Pd

Derek Holzer wrote: VANILLA PD *SIGNAL CONTROLLED* vcf~ moog~ is moog~ really in vanilla? (not here (0.42-5), unforunately, though i think it should be...) bis denn! martin ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management

Re: [PD] basic resonant filters in Pd

Didn't check that one too closely, I guess. I assumed it was vanilla. D. martin brinkmann wrote: Derek Holzer wrote: VANILLA PD *SIGNAL CONTROLLED* vcf~ moog~ is moog~ really in vanilla? (not here (0.42-5), unforunately, though i think it should be...) bis denn! martin -- :::

Re: [PD] basic resonant filters in Pd

Hallo, brandon zeeb hat gesagt: // brandon zeeb wrote: Good call! I explored the GGEE objects in Pd-extended, which led me to their source code (A+ for readability), which led me to this: http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt The filter objects in the rjdj-lib just do these

Re: [PD] basic resonant filters in Pd

there is also bq~ in the nusmuk floder + all abstraction to compute the filter coef. bq~ is a simple biquad, but with audio input for filter coefs. C Derek Holzer a écrit : Hi Brandon, here ya go! VANILLA PD *SIGNAL CONTROLLED* vcf~ moog~ *MESSAGE CONTROLLED* lop~ bp~ hp~ biquad

Re: [PD] basic resonant filters in Pd

Hey, I've implemented the same coefficients as the ggee [lowpass] external in Pd, and can't seem to figure out where my calculations are off. The calculations are in the [pd lowpass] sub patch. Any ideas? ~Brandon On Sun, May 17, 2009 at 2:43 PM, Frank Barknecht f...@footils.org wrote: