An Apple Siri mystery has been solved by an audio engineer — spectrogram reveals how Apple stopped voice assistant setting off millions of iPhones and HomePods during its WWDC 2026 event
- Apple avoids setting off your iPhone when its execs say “Hey Siri” at events
- One enterprising engineer decided to find out why
- By analyzing the keynote’s audio, they solved an intriguing mystery
Siri has just been given the brain transplant it's needed for years, but it's always been good at detecting the words "Hey Siri" — so much so that accidental summonings have been a common problem. But an audio engineer has just explained how Apple cleverly avoided Siri popping up on your phone during its recent WWDC 2026 keynote.
As revealed by Techexplain on Substack, it all comes down to the audio frequencies embedded in Apple’s keynote video. Once Apple’s audio engineers made a few subtle tweaks, the company’s presenters could say “Hey Siri” as much as they liked without risking millions of phones going off around the world.
To find out what was going on, Techexplain downloaded...
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