Regarding dectalk and doubletalk speech, some of us prefer the latter. I
have used both and like the performance and speech of doubletalk over the
other. To modify the sound quality, but not the nature of the speech
itself, I have found that placing a folded thick cloth over the speaker on
the doubltalk lt. shapes the sound output in a more natural way, filtering
out some of the extrainious higher frequences above approximately4 kh.
This is the range above which the telephone cuts off speech also for best
intelligibility. The sound some find objectionable is in my experience a
matter of extrainious sounds created by the speaker in the synth. box, very
cheap junck, and not the text to speech chip itself. Using a combination
of cloth filtering and the sound controls of the speech software, one can
greatly modify the sound quality and intelligibility to one's preference.
I would imagine this approach works also with the internal doubletalk and
it's external speaker.
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