[sdiy] Polymoog resonator question

Ian Fritz ijfritz at comcast.net
Mon Oct 15 18:39:05 CEST 2018

By coincidence, I recently ported my old analog 36-band fixed-frequency filter bank monstrosity into Reaktor.  I kept it just like the original, then added goodies like a built-in swept test oscillator and a little sequencer.  So I’ve been looking at formant responses for that application.  It’s got a big bunch of controls to set, so being able to save and recall presets is really nice!  Already, I’ve put in the Matthew/Kohut string filter response with a control to vary the spacing and resonance of the bands.  Amazing how easily this can be done!


> On Oct 15, 2018, at 7:32 AM, rburnett at richieburnett.co.uk wrote:
> Thanks for the suggestions re formant frequencies.  Sadly, this isn't likely to be something I'll get chance to implement myself in the short-term, but the information would surely be useful to others.  It just seemed to me that tabulated formant data was the final missing piece in the jigsaw once you have your filter bank that can dial in whatever formants you want to impart to the sound.  The formant filter implementation could be either an analogue filter bank or some digital signal processing.  To my mind the latter method sounds well suited to quickly switching the formant frequencies and bandwidths from that of one instrument to another, or morphing, or mimicking vowels, or whatever...
> -Richie,
>> On 2018-10-14 21:14, Ian Fritz wrote:
>> Richie --
>> The most recent studies I am aware of are the ones by Backus and by
>> Mertons. Earlier work is reproduced in Olsen "Music, Physics and
>> Engineering", which is the only one I have.
>> Ian
>>> On 10/14/2018 6:51 AM, Richie Burnett wrote:
>>> Out of interest does anyone know of any published tables of resonances (formants) for common acoustic instruments?
>>> I've seen tables listing something like the frequencies of the first 4 formants for the male and female vowel sounds in speech, but have never seen the equivalent for things like a guitar's body resonances.
>>> -Richie,
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