[music-dsp] Need Tb303 type lowpass resonant 3th order filtering algorithm...
tweggen at cybernoia.de
Wed Oct 3 13:46:56 EDT 2001
Jon Watte wrote:
>It seems you have the algorithm already done. All you need is some careful
>attention to noise shaping and quantization errors, and you should be fine.
>Note that most people prefer to use cascaded second-order filters, rather
>than a single higher-order filter, for this very reason.
> / h+
>PS: please try to not post HTML to mailing lists; at least not this one.
>From: owner-music-dsp at shoko.calarts.edu
>[mailto:owner-music-dsp at shoko.calarts.edu]On Behalf Of Miracle Band
>Sent: Tuesday, October 02, 2001 1:57 PM
>To: Music DSP list
>Subject: [music-dsp] Need Tb303 type lowpass resonant 3th order filtering
>Does anybody have the algorithm or maybe source code in any language of 3th
>order lowpass resonant filter.
please correct me if I'm wrong, but I've read (german Keyboards
magazine) that the TB
actually has a 4th order filter, which due to sloppy tolerance in the
circuit effects in
a ca. 18db/oct filter. Can anyone confirm this?
>I have experimented with many algorithms (include digital implementation of
>Butterworth 3-th order Lowpass with feedback) and cascade schemes, but
>unstability occurs on high (after 18000 Hz) frequencies and produces
>floating point overflow errors...
>Ilya A. Zimnovich,
> The Miracle Software Group.
>dupswapdrop -- the music-dsp mailing list and website: subscription info,
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