We ask you to say the phrases “Ok Google” and “Hey Google” two times each. Those phrases are then analyzed by a neural network, which can detect certain characteristics of a person's voice. From that point on, any time you say ‘Ok Google’ or “Hey Google” to your Google Home, the neural network will compare the sound of your voice to its previous analysis so we can understand if it's you speaking or not. This comparison takes place only on your device, in a matter of milliseconds.

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