[PD] bugs with [hip~] and [bp~]

Alexandre Torres Porres porres at gmail.com
Fri Jan 30 02:39:55 CET 2015

it's how the filters were designed, they're not perfect throughout the

you'll need to use/build other filters for that purpose of working with
that higher portion of the spectrum (in which I can hardly still hear, by
the way)/


2015-01-29 20:28 GMT-02:00 Gilberto Agostinho <
gilbertohasnofb at googlemail.com>:

> Hello all,
> An user reported a bug in the forum about some problematic behaviours of
> certain filters in pd-extended 0.43.4, particularly [hip~] and [bp~]. I
> found this bug to be also present in pd vanilla 0.46.5. Basically, these
> filters do not respond to frequencies higher than approximately 12 kHz, in
> contrast to [vcf~] which responds to any frequency. This can be very
> clearly observed in the case of [bp~] using a narrow band frequency sweep.
> Here is a video showing the problem: http://youtu.be/A7mPhiHcmhc
> Here is the topic in our forum where this discussion started:
> http://forum.pdpatchrepo.info/topic/8967/highpass-hip-not-
> working-as-expected/18
> Here is that user's bug report concerning pd-extended:
> https://sourceforge.net/p/pure-data/bugs/1187/
> Finally, here is the patch I am using to test this (I am using
> [spectrogram~] (which in its turn needs [metrum] and [multiplex~], all of
> which are included in this compacted file): https://www.dropbox.com/s/
> fcwciwe8klwh5xz/filter-test.zip?dl=0
> NOTE: the user that reported the bug argues that pd vanilla 0.45.4 does
> not produce any problems, but I firmly believe this to be a mistake of him.
> I tested these filters in both 0.45.4 and 0.46.5 and both produce the same
> behaviour. I tried to contact him to ask for further tests (he was not
> using my patch above for his own tests), but so far I got no reply. Also,
> other users confirmed this bug to be present in both vanilla and extended.
> Please let me know if I can be of any help with this.
> Best,
> Gilberto Agostinho
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