[PD] basic resonant filters in Pd

[Mike Moser-Booth]

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 at gmail.com>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> 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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-- 
Mike Moser-Booth
mmoserbooth at gmail.com
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