A nice "easy" way of achieving this is to simply use the amplitude of spoken speach as they did with the electro-mechanical puppets of "thunderbirds" back in the 1960's rather than trying to have their lips move according to the sounds themselves. My thinking here is is that the closer one gets to an animation of any human expression or movement on a robot - or an avatar - resembling actual human movement, the more unsettling, sinister and weird it seems to a human viewer. Ergo, a simple mechanism to show who is speaking, may prove to be more acceptable than one more closely resembling human speech lip-movements....?
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