[music-dsp] Need Tb303 type lowpass resonant 3th order filtering algorithm...

[Timo Weggen]

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.
>
>Cheers,
>
>            / h+
>
>PS: please try to not post HTML to mailing lists; at least not this one.
>
>
>-----Original Message-----
>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
>algorithm...
>
>
>Hello!
>
>Does anybody have the algorithm or maybe source code in any language of 3th
>order lowpass resonant filter.
>
Hello,
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...
>
>Thank you!
>
>Ilya A. Zimnovich,
>  The Miracle Software Group.
>
>
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>http://shoko.calarts.edu/musicdsp/
>
>




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