[PD] iemlib low pass filters exhibiting jitter?

Mike Moser-Booth mmoserbooth at gmail.com
Wed Mar 2 19:59:44 CET 2011

I've noticed this, too. It sounds like the noise you'd get if you were just
using [line] to change the frequency. My guess is the cutoff frequency is
being sampled and held at the block boundaries. If you put these objects in
a patch with [block~ 1], it goes away.


On Wed, Mar 2, 2011 at 11:25 AM, Luka Princic // Nova deViator <
nova at deviator.si> wrote:

> 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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Mike Moser-Booth
mmoserbooth at gmail.com
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