[sdiy] Other resonator designs

[Scott Nordlund]

It's certainly interesting territory.  This may be anathema to sdiy types, but this sort of thing can be much more deeply explored in software.  I have found some piano soundboard, violin, viola, etc. impulse responses and I think that these (as well as FFT equalizers) can give a more intense and interesting (to me) effect than the sort of stuff that's easily achieved in the analog domain.  Of course, I'm only speaking of fixed formant filters; I'm not discounting other applications of filter banks and multiple voltage controlled bandpass filters.

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> To: synth-diy at dropmix.xs4all.nl
> From: tom at electricdruid.net
> Date: Wed, 12 Aug 2009 23:19:36 +0100
> Subject: [sdiy] Other resonator designs
>
>
> I'm definitely a fan of resonators, and not just for sweepy, phasey
> filter weirdness. JH has some demos on his site of how well-placed
> filters can make a string sound very much more stringy, and Ken
> Elhardt's polymoog resonator demo shows a similar improvement on some
> basic brass sounds. Most (all?) acoustic instruments include some
> cavity or body that resonates to increase the volume and improve the
> tone. Sounds without this character sound artificial, and that
> (unfortunately) covers a lot of synths. Which is not to say that
> sometimes pure, synthetic, artificial sound isn't what you're after,
> but I like the idea of having a virtual instrument body to tweak
> along with other sound parameters.
>
> With this in mind, all this discussion of resonators set me looking
> at various schematics for them again.
>
> There's the PolyKorg version, very simple and based on vactrols, but
> bandpass response only, and no resonance control:
>
> http://homepage2.nifty.com/rjb/pdf/
> rjb_diy_synthe_701a_resonator_schem_revA.pdf
>
> or alternatively:
>
> http://www.modular.fonik.de/pdf/PS3100.pdf
>
> Then there's state variable filter based designs, which have all the
> options, but are quite a bit more complicated, like this one, based
> on the MFOS SVF.
>
> http://mypeoplepc.com/members/scottnoanh/birthofasynth/id25.html
>
> I've done a similar SVF resonator stage myself, based on Roman Sowa's
> Dual SVF design (although I haven't got the LPF and HPF outputs on
> this schematic):
>
> http://www.electricdruid.com/VCResonator.jpg
>
> (basically just the filter from http://sowa.synth.net/modular/vcf.html)
>
> The Polymoog SVF design that Florian posted earlier, good but not
> voltage controlled like the ones above:
>
> http://fa.utfs.org/diy/polymoog/polymoog_resonator_schematics.jpg
>
> Enjoy!
> T.
>
>
>
>
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