increasing naturalness of vowel synthesis
I've created a source signal from scratch using PitchTier and PointProcess for vowel synthesis.
"To Sound (phonation)" command provides a couple of parameters to manipulate the naturalness of the glottal source, and I've had some success, but would still like to increase the naturalness. My problem is that I still get this attack like onset, and the vowel sound monotonous and the voice is "tight". I think I've got the pitch contour alright, but does anyone have suggestions for what other parameters I could try (e.g. how to add some jitter), and/or what would be good values for those parameters that are available in the To Sound (phonation) command?
Thanks, and best wishes, -Jyrki
New temporary address from July 2006 to Autumn 2007
Jyrki Tuomainen, University College London, Human Communication Science
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At 11:21 +0000 11-12-06, Jyrki Tuomainen wrote:
I still get this attack-like onsetdid you already try lowering the "adaptation factor" to 0.5 or so? If not, then try; if you did, then a multiplication with an IntensityTier may help.
the vowel sounds monotonousthis should depend on not much more than the PitchTier that you used to create the voice pulses. You could include a short rise at the beginning. Other suggestions are welcome.
and the voice is "tight".a spectral issue. Make sure that you apply at least 10 formants. I assume that you did that all right, so now I'm waiting for suggestions.
how to add some jitterSelect the PointProcess, choose "To Matrix", then "Formula":
self + randomGauss (0, 0.0001)
then "To PointProcess". Perhaps this is a good moment for me to make a Formula command for PointProcesses.
what would be good values forPowers of 2 and 3 (rather than 3 and 4) would yield something close to Rosenberg's glottal source model, which was also used in the Klatt synthesizer. But 3 and 4 have been chosen as defaults because they seem to approximate better the known relations between human glottal parameters.
Any better wisdom on this would indeed be very welcome.
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