This is a brilliant idea. I'm curious about a lot of the implementation specifics like how audible the white noise is in a silent room and what kind of UX trade offs it brings.
Yeah, I'm wondering how it should work when you say the wake word too. Like if I say "Sister Assumpta, what's the weather like?" is it just going to repeat the same command but replace "Sister Assumpta" with "Hey Google?" Thus slowing the whole thing down?
Seems to me based on the description that it only says "Hey Google" to the device and then lets your voice through by cutting off the white noise. That would mean the only delay would be between when you say the wake word and when Google starts listening.
The article says that after your keyword it deactivates the white noise wall for a while, and whispers the original keyword. So alexa / google / siri will hear you directly.