Formant like?

[Thierry Rochebois]

>Speech sounds can be characterised
>by the position or movement of formant frequencies and to a lesser extent
>formant bandwidths.

The movement is very important for good synthesis.
I designed a three-filter formantic banc with my students.
It is controlled by a preset selector (made of 4051 CMOS switches),
the speed of the transients is controlled thanks to an FSR (Force
Sensing Resistor).
Thus, with 4 fingers, you can select a preset from 8 (3 bit encoded)
and control the transient speed.

I used 3 2-pole filters, I think that 4-pole filters are better for this kind
of sound. YUu also may care about the resonance quality...

If you want to obtain voice like sounds, use a sawtooth or assymetrical triangle
with a strong vibrato.

Here are some formants for voyels... extracted from my own frenchy voice !

A	730	1090	2440
O	400	900	2300
U	250	1700	2100
OU	190	800	2000
E	350	1900	2500
AI	550	1600	2250
AN	550	850	1900
ON	450	1100	1500
EE	390	1990	2550


Thierry Rochebois
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|  Thierry Rochebois      Tel: 01 69 15 40 71  Piece 353      | +
|  Traitement du Signal Acoustique                            | |
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|  thierry at ief.u-psud.fr                  FRANCE              | |
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|  Synthesizers, Theremin, DSP, Free-lance journalist...      | |
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