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

[Alexandre Torres Porres]

a few of patches of mine that describe the behaviour of vanilla and some
extended filters

2015-01-29 23:39 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:

> it's how the filters were designed, they're not perfect throughout the
> spectrum
>
> 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)/
>
> cheers
>
> 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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>>
>
>
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