[PD] iemlib low pass filters exhibiting jitter?

[cyrille henry]

Le 02/03/2011 20:33, Ingo a écrit :
> I'm having the same problem. It's like a zipper noise that you can't avoid
> no matter what interpolation time you set. If you set it to 150 ms or above
> it works. But how can you have fast attacks like that?
> At the moment I am changing interpolation times after the initial attack
> time of the envelope generator. So I got rid of most of it. But still some
> noise during the attack period.
>
> Moog filter has audio ins.
the biquad object from nusmuk audio (bq~) does also have audio inlet for filter coef.
since it's a biquad, you can shape your filter...

c

That one works a lot better but has a rather
> fixed, predefined (but good) sound.
>
> Ingo
>
>
>> -----Ursprüngliche Nachricht-----
>> Von: pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at] Im Auftrag von
>> Luka Princic // Nova deViator
>> Gesendet: Mittwoch, 2. März 2011 17:26
>> An: pd-list at iem.at
>> Betreff: [PD] iemlib low pass filters exhibiting jitter?
>>
>>
>>
>> hi,
>>
>> just a quick question,
>> is it normal or somewhat on purpose that all versions of low pass
>> filters in iemlib (from lp2 - lp10 and cheb, butt, bess and crit)
>> exhibit slight high pitched jitter when cutoff frequency is being
>> dynamicly changed? is it a nature of such filter or just a type of
>> implementation that somewhat doesn't take care of interpolation (if
>> interpolation is a problem at all)?
>>
>> any thoughts welcome...
>>
>> is there a way i could avoid that jitter with these filters?
>>
>> is there some other high-pole low pass filter in some other library i
>> could use?
>>
>> sure, i can always use series of [lop~] ..
>>
>>
>>
>> best, luka
>>
>>
>> --
>> sujet est machinique!
>> Nova deViator ¤ http://deviator.si ¤ http://skylined.org ¤
>
>
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