While I can't speak to what AndrewUnmuted is referring to with Amazon, I know Google Now transmits more than just the command / audio after the wake word: it ac

While I can't speak to what AndrewUnmuted is referring to with Amazon, I know Google Now transmits more than just the command / audio after the wake word: it actually transmits 2 - 3 seconds before and including the wake word. You can confirm this yourself: if you visit this page at Google, you can hear every Google Now voice query you've made, and verify it includes audio before & including the "OK Google" trigger phrase: https://history.google.com/history/audio https://history.google.com/history/audio