eli5: How does siri hear me say “hey siri” if it isn’t constantly listening to my conversations or me speaking?
In: 17336
They have a program specifically listening for those two words specifically, designed to use as little power as possible while listening. It just needs to be able to tell the phone “I HEARD THE WORDS!” when you say it, and keep quiet and use as little power as possible the rest of the time.
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