Oh, completely forgot. Here's a step-by-step description of the TPT method:
http://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/VAFilterDesign_1.0.3.pdf (A4 format) http://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/VAFilterDesign_1.0.3_A5.pdf (A5 format)
On 04-Nov-13 11:07, Vadim Zavalishin wrote:
Hi Chris Direct forms are not good for coefficient modulation, plus IIRC they tend to have precision issues at low cutoffs. I guess, the TPT (ZDF) approach can solve your problem completely: http://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/KeepTopology.pdf (For the 2nd order filters use the modes of the SVF from the same paper) If you can read Reaktor Core, then here's some additional info: http://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/KeepTopologyRC.pdf Regards, Vadim
-- Vadim Zavalishin Reaktor Application Architect Native Instruments GmbH +49-30-611035-0 www.native-instruments.com -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
