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[–] prairie ago 

Morons. This is like the pre-record function of a voice recorder or camera, where it continuously records in a memory loop, and when you hit record (or in this case Alexa's trigger word is heard), it goes back in the memory buffer and effectively listens before the trigger. If they wanted to record (and save) everything, they're already doing it, and they don't need a patent to do that. They're probably patenting this so they can make other companies pay to use this approach (which is moronic because there's nothing very novel about it, it's pretty obvious to anyone who's done audio processing).