[sdiy] Polymoog resonator question

Richie Burnett rburnett at richieburnett.co.uk
Tue Oct 16 22:23:36 CEST 2018


Digital certainly has its advantages :-)

-Richie,


-----Original Message----- 
From: Ian Fritz
Sent: Monday, October 15, 2018 5:39 PM
To: rburnett at richieburnett.co.uk
Cc: synth-diy at synth-diy.org
Subject: Re: [sdiy] Polymoog resonator question

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!

Ian

> 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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