I listened to the gnuspeech demos a number of times over the years. I
was always fascinated by the pleasant intonation and formant
trajectories - but was quite put off by the unnatural, formant
synthesizer-like timbre.
To rekindle the love, I hacked up a Kelly-Lochbaum TRM in Java:
http://www.youtube.com/watch?v=tzAnkDki8SU
The toy UI I have on top of it is the "Four Tube Vocal Tract Models of
Vowels" from
http://clas.mq.edu.au/acoustics/frequency/vocal_tract_resonance.html
just to have an simple yet phonetically somewhat meaningful way of
playing with it to get a rough idea of the wovel quality to be expected
from such a model.
Andras
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