Comment by ivape

21 hours ago

Doesn't it have to listen to everything to capture the wake word "hey siri"? How else is it done?

The iPhone has dedicated low-power on-device hardware that is trained to pick up "Hey Siri" exclusively. It only wakes up the rest of the device and captures additional audio after that wake word has been triggered.

https://machinelearning.apple.com/research/voice-trigger

https://machinelearning.apple.com/research/hey-siri