Apple Cut Frequencies in WWDC Keynote to Prevent Siri Activations - MacRumors
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Apple Cut Frequencies in WWDC Keynote to Prevent Siri Activations
Friday June 12, 2026 6:23 am PDT by Hartley Charlton<br>Apple appears to have modified the audio of this week's WWDC 2026 keynote video whenever "Siri" was mentioned, apparently in an effort to prevent viewers' nearby devices from waking inadvertently during the presentation.
The technique was spotted by observers on X, who shared spectrogram screenshots showing clear gaps in those specific frequency ranges coinciding precisely with instances of the ‌Siri‌ name throughout the video. Apple appears to have cut out the 3kHz, 4kHz, 5kHz, and 6kHz frequency bands.
fun fact: tijdens de keynote hakt Apple een stukje 3k, 4k, 5k en 6kHz eruit wanneer ze "Siri" zeggen, zodat niet iedereens HomePods terug beginnen te praten ️ pic.twitter.com/x13WbNPztr<br>— luuk de leest (@luuk58) June 8, 2026
The approach is designed to defeat wake-word detection, which relies on recognizing the acoustic profile of phrases like "‌Siri‌" and Hey ‌Siri‌." By surgically removing the frequencies that carry key phonetic energy in the word "‌Siri‌," Apple can reduce the likelihood that HomePods, iPhones, iPads, and Macs in a viewer's home will trigger while the keynote plays back.
The technique does not appear to have been fully effective, however, as multiple viewers reported their devices activating anyway during the stream.
In 2017, Amazon was found to use a similar approach in its Alexa TV commercials, notching out frequencies to avoid triggering Echo smart speakers in viewers' homes.
Related Roundup: WWDC 2026<br>Tags: Siri Guide, WWDC 2026<br>Related Forum: Apple, Inc and Tech Industry
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Top Rated Comments
Zc456<br>1 hour ago at 06:28 am
Maybe this whole voice activation thing isn't a good idea.<br>Score: 6 Votes (Like | Disagree)
tweaknmod<br>1 hour ago at 06:29 am
My god… i sometimes forget how insanely thorough internet detectives are…<br>Score: 5 Votes (Like | Disagree)
jonnysods<br>1 hour ago at 06:48 am
I keep the listening mode for Siri off as I don't like it and it seems so sensitive to activation.
So now on my other friends devices I like to say as fast as i can: "hey siri, tell my wife to shut up" and watch them panic.<br>Score: 2 Votes (Like | Disagree)
Hajj.david<br>1 hour ago at 06:35 am
I don’t even use ‘hey Siri’ anymore
I pretty much only use the new ‘type to Siri’ feature on my iPhone - I used it yesterday when I was at the library! No need to speak into the phone, just typing, works so much better
Well the new siri now has actually good dictation so Ive been using voice again after giving up years ago because of how useless it was.<br>Score: 2 Votes (Like | Disagree)
Marzzz<br>51 minutes ago at 07:05 am
At work I had to dictate notes; every time I said “a series of…” it would activate Siri. Drove me crazy until I deactivated it.<br>Score: 1 Votes (Like | Disagree)
jarman92<br>52 minutes ago at 07:04 am
TIL that “fun fact” in Dutch is “fun fact” 😅<br>Score: 1 Votes (Like | Disagree)
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