[L2Ork-dev] filters

Gilberto Agostinho gilbertohasnofb at googlemail.com
Sat Jan 31 12:16:35 UTC 2015

Hmm, I just realized I had forgotten about the commit "*added 
experimental bugfix to the bp~ and hip~ bug" (from 
). I still haven't compiled and tested it yet, but if [hip~] behaves 
properly now then please ignore my previous message.


On 31/01/15 12:59, Gilberto Agostinho wrote:
> Hello all,
> Recently I wrote a message here and in pd's mailing list about some 
> possible bugs involving the filters [hip~] and [bp~]. As it turns out, 
> those were not bugs but rather limitations of the algorithms 
> themselves (the discussion in pd's mailing list can be found here: 
> https://www.mail-archive.com/pd-list@lists.iem.at/msg02169.html )
> The filter [bp~] cannot be used for frequencies higher than 12 kHz, 
> which in the end is not much of a big deal in most cases (and in those 
> cases, there is always [vcf~] to solve it since it does not show this 
> limitation). But the problems with [hip~] cannot be that easily 
> ignored: it does not output -3 dB at the cutoff frequency as expected. 
> But another high pass filter included in pd, [iemlib/hp1~], does this 
> perfectly well and also has no limitation for higher frequencies.
> So here is the thing: we do have this perfectly good high pass filter 
> that is slightly more hidden than what most people consider to be the 
> "default" HP filter (virtually all tutorials and books about Pd use 
> [hip~], and I guess the majority of users are very likely to be using 
> it only). So why not make [hp1~] the default filter itself? That is, 
> replace [hip~] for [hp1~].
> I know this is not very orthodox, it may break someone's patch if that 
> patch depends on this inconsistency of the original [hip~] and when 
> opening a patch in pd vanilla or extended you would be welcomed with 
> the original [hip~], but in the end it would make pd-l2ork better in 
> my opinion.
> Best,
> Gilberto

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