I take it you're using this formant table:


The Hz-to-Q conversion is described in the caption of the illustration here:


-3dB attenuation is the usual passband threshold, as discussed further in
the link below, and I expect (?) it's appropriate to use with the present


A secondary issue is the choice of waveform to feed into a formant filter,
and how to approximate a real "glottal pulse".  There is some interesting
discussion here


building on work in this old paper


On Tue, Feb 6, 2018 at 8:56 PM, Frank Sheeran <fshee...@gmail.com> wrote:

> I'm hoping to make some formant synthesis patches with my modular soft
> synth Moselle. http://moselle-synth.com
> I've looked around for formant tables and find tables with more vowels and
> fewer formants, or fewer vowels and more formants.  Tables with amplitude
> seem to have fewer vowels and only one I've found shows Q.
> But the Q (as shown in CSound documentation, one example pasted below) is
> specified in Hz.
> The parametric (const and non-const) filters I'm using need a Q input.  Is
> there a formula to convert Hz into Q?
> Failing that, is there a standard amplitude at which which a bandwidth
> would be measured in Hz?  EG, at -6dB or -12dB or something?  If so I could
> just eyeball it on a graph.
> Final question: does anyone know a more comprehensive set of such data?
> This CSound data is great but only covers 5 vowels.
> Frank Sheeran
> *soprano "a"*
> freq (Hz)  800  1150  2900  3900  4950
> amp (dB)  0  -6  -32  -20  -50
> bw (Hz)  80  90  120  130  140
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