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

Date:
Wed, 24 Jun 2026 11:14:49 +0000

Description:
An engineer has shown why Apples presenters dont set of Siri on your iPhone during events.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter 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 keynotes 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 Apples keynote video. Once Apples audio engineers
made a few subtle tweaks, the companys 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 the audio and video
from the WWDC event. They fed that into a spectrogram analyzer, which is an app that can visualize audio frequencies as colored graphs and bands. When
the WWDC video was examined, it revealed that a few frequency bands in the 3kHz to 6kHz range had been removed from the audio. Latest Videos From Watch full video here:

And this is the key to the video not invoking Siri. Without those four frequency bands, the Siri assistant lurking on your device did not hear the phrase Hey Siri even though Apples presenters said it repeatedly throughout the show. Wait, how exactly does this work? (Image credit: Apple) Apples solution might sound odd. After all, doesnt Siri listen out for the trigger words being spoken? If those words were present in Apples video, shouldnt
Siri have been activated? You may like Inside how Apple built the all-new
Siri AI with Google and Nvidia's help Apple explains why Siri AI was delayed so extensively Apple WWDC 2026 as it happened: Siri AI, iOS 27, macOS Golden Gate, and more announcements

Well, not quite. Your iPhone contains an always-on processor chip whose job
is to constantly sample background audio, which is then fed into a neural network. The audio is converted into a spectrogram and the neural network analyzes it to look for a specific frequency pattern in this case, the sibilant sound that occurs when you say Siri. And yep, you guessed it, those sibilant sounds mostly exist in the 3kHz to 6kHz range.

In other words, what Siri is actually listening out for is a frequency rather than the words being spoken. It means that if Apples engineers remove the
3kHz to 6kHz bands from the WWDC keynote, Siri wont hear its name being
spoken even if thats exactly what the presenters are doing. Get daily insight, inspiration and deals in your inbox Sign up for breaking news, reviews, opinion, top tech deals, and more. Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.

Its a clever trick that helps ensure Apples presenters can speak naturally without the need to avoid saying Siri. At the same time, it avoids setting
off millions of iPhones and annoying their owners when Hey Siri is uttered. Its an ingenious solution that solves a thorny problem in a satisfyingly elegant way and we wouldnt expect anything less from Apple. Follow TechRadar on Google News and add us as a preferred source to get our expert news, reviews, and opinion in your feeds. Todays best iPhone deals Todays best iPhone deals Contract Deals Sim Free gift Apple iPhone 17 24 months Unlimited mins Unlimited texts 10GB data 19 upfront 34.99 /mth View at Mobiles.co.uk
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Link to news story: https://www.techradar.com/ai-platforms-assistants/an-apple-siri-mystery-has-be en-solved-by-an-audio-engineer-spectrogram-reveals-how-apple-stopped-voice-ass istant-setting-off-millions-of-iphones-and-homepods-during-its-wwdc-2026-event


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