Apple reveals AI magic behind ‘Hey Siri’

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Siri do not disturb
Apple puts a lot of AI tech into Siri.
Photo: Ste Smith/Cult of Mac

A tiny, low-power auxiliary processor that constantly listens for the phrase “Hey Siri” enables one of the most basic features of Apple’s AI assistant.

The processor, embedded in the iPhone’s motion coprocessor, keeps the “Hey Siri” command from running on the device’s main processor all day. That revelation comes in a research paper published today by Apple’s machine learning team. The paper dives deep into how Apple uses AI to power “Hey Siri.”