[PD] biquad~ vs. svf~

guenter geiger geiger at xdv.org
Fri Feb 27 21:41:18 CET 2004

On Fri, 27 Feb 2004, Tim Blechmann wrote:
> hi all,
> i'm currently using biquad filters (i'm getting the settings from
> iemlib's lowpass, highpass (...) externals).
> i consider to change my patch to use svf~ from the cyclone library.
> does anyone know, which algorithm is more expensive in terms of cpu
> time? and are there any mayor differences in the characteristics of
> these two filter types?

I think they are completely different. Biquad~ at least is not really
good if you want to control in the signal domain. The lowpass etc
externals implement the filters from here:

 written by Robert Bristow-Johnson

Then the last time I saw them they were written by me, and not part of
the iemlib, but how knows, ... in reality the hard work was done by
Robert Bristow-Johnson.


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