[sdiy] Digital 4 Pole Multimode Filter

Andrew Simper andy at cytomic.com
Thu May 3 07:27:58 CEST 2018

On 2 May 2018 at 21:35, Tom Wiltshire <tom at electricdruid.net> wrote:

> You could have a look at Antti’s Powerwave synth paper from DAFX 05. It’s
> an FPGA-based synth that uses a Moog-model for the filter if I remember.
> That’s a much simpler structure than an SVF. Furthermore, the Powerwave
> uses pole-mixing (a la Xpander) to provide multiple different responses.
> After all, in the digital realm, there’s really no reason not to.
Even in the linear sense there is still a good reason to use two cascaded 2
poles or a 4 pole SVF because the responses are fundamentally different
from 4 cascaded one poles with feedback and pole mixing.

In the non-linear case the differences are greater again.


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