The quality of a schwa

When it is necessary to give a schwa a distinct quality, how is it
determined what quality to give it? For example, a speech synthesizer
would presumably need to produce a schwa as a vowel with some quality
it decides on; it hardly seems possible for it to produce a vowel with
indistinct quality. Is the quality based purely on the surrounding
context (such as the articulation of the consonants adjacent to the
schwa) or is it different for different languages?

The reason why I ask is that while this metric restoration of the Rig
Veda seems a remarkable piece of work, the qualities of some of the
restored vowels jars one's senses; when I hear a trisyllabic rendition
of Indra, it always has a closed schwa making it something like
[indI"r@] or at any rate, no more open than [inde"r@].

The name "índra", similarly, is often trisyllabic, "índara".
http://www.utexas.edu/cola/centers/lrc/RV/

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Relevant Pages

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  • Re: The quality of a schwa
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