[PD] filter stability

[Antoine Rousseau]

I think the maximum Q factor without ripple (i.e Butterworth) is 0.707.

Le mer. 27 avr. 2022 à 21:07, Alexandre Torres Porres <porres at gmail.com> a
écrit :

> Em qua., 27 de abr. de 2022 às 11:54, Roman Haefeli <reduzent at gmail.com>
> escreveu:
>
>> Isn't a low steepness in the filter in the feedback loop desired
>> anyway? Me thinks a low steepness means the change in timbre happens
>> more slowly which - I imagine - would sound nicer than a sudden
>> 'tziewhh'.
>
>
> Interesting discussion. The suddenty depends on the cutoff  frequency as
> well, and also on the decay/feedback parameter. I guess my problem with the
> lop~ (a single 1-pole) like filter is that it doesn't work well for higher
> frequencies. Perhaps a 1-pole and 1-zero filter is better as we need a
> proper zero at nyquist. The original 2 sample average filter in the KP
> algorithm is actually just that, a single 0 at nyquist, but it's only a
> quite high cut filter and you can't set a proper cutoff frequency.
>
> I guess I have to test and see how different does it sound and how more
> efficient it is.
>
> I already just broke my pluck~ object for a better design maybe I'll also
> change the default filter inside.
>
> cheers
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