That's actually great user experience and I'm certain someone will make a product with a similar idea (physical movement that signifies the bot is listening and talking).
AFIK, Alexa doesn't have an API the gives speech timing info. I assume this must monitor the sound and trigger a mouth movement whenever the wave amplitude goes over a certain threshold. Would be cool to make a reusable monitor/trigger component along with different swappable animatronic figures (cats, ardvarks, Trump's head, ...). I'd buy one for the office.
As an aside, I find Alexa's voice much better than either Google Now or Siri. It still sounds a bit robotic, but it feels quite soothing compared to the harsh Google Voice or the "too robotic" Siri.
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