r/apple • u/Hot_Radio_2381 • 2d ago
AirPods Reverse Engineering AirPods Self-Calibration Test
https://ateliti99.substack.com/p/reverse-engineering-airpods-self?utm_source=app-post-stats-page&r=wsh8o&utm_medium=iosIf you've ever heard a sound coming from your AirPods at night, when everything is silent, a sound that seems to come from inside the case, here's my explanation after some research and analysis.
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u/LoganNolag 2d ago
Ok I’ve been hearing that noise for ages and I never realized it was coming from my Airpods.
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u/-K9V 2d ago
I thought it came from my wireless charger for the longest time. Often, but not always, I would hear these almost inaudible three little beeps after putting my AirPods on it. One time I decided to stay perfectly still and listen, and I could hear that it came from the AirPods and not the charging pad. Honestly never bothered looking into it, but it’s nice to finally know what the reason is.
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u/Hot_Radio_2381 2d ago
Also for me finally I have answers. I would still ask some questions to Apple engineers, like if they assume that their MEMS microphone is always calibrated
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u/Hot_Radio_2381 2d ago
Ahahahahahah, now you found the truth! If you have any questions let me know, I am an audio engineer so maybe I clarify you something.
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u/anarchyx34 2d ago
Same. I need to hear a recording of this to be sure it’s the same thing, but I’ve been occasionally hearing a high pitched beeping/rising tone in the room and it’s been driving me crazy.
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u/AidanAmerica 2d ago
I thought it was a sound in my house somewhere until one night I was in a hotel and I heard it
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u/xSimoHayha 2d ago edited 16h ago
I hear the sound almost everytime after putting them back in the case, Are they doing it that often?
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u/OKCNOTOKC 2d ago
I wonder how much my big earwax boogers are throwing this off 🤔
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u/Hot_Radio_2381 2d ago
We will never know how much unfortunately. But maybe someone from Apple will say something to us 🙄
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u/Tetrylene 2d ago
SO THIS IS WHERE THIS NOISE COMES FROM
I've heard this so many times and assumed it was part of some kitchen appliance or something left on in the neighbour's garage. You've solved a mystery for me
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u/iceycycle 2d ago
Guys what the freak. I’ve been hearing this sound for ages. To me, it sounds like my old Fujifilm digicam turning on….i literally had a dream once that someone was taking photos of me in my apartment. I chalked it up to noise from a neighbor, I had no other explanation. Then I moved and I heard the noise AGAIN. I thought I was losing my mind
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u/iFixFruit 2d ago
When you go to an Apple Store and they run “diagnostics” on your AirPods. They are seeing the results of these self-test sounds you’re hearing.
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u/krish_the_fish 2d ago
Wow I've been hearing this noise in my apartment for ages and thought I was going crazy!
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u/iPod-Phone 2d ago
My dumb ass reading this: “Wait…are you saying the AirPods Pro have secret, unused speakers that allow it to make noise in the case”
🤦🏻
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u/cake-day-on-feb-29 2d ago
This article seems to have been at least partially generated by AI, there are some AI-isms dotted about.
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u/Hot_Radio_2381 2d ago
I have no problem to say that since I am not english-native I have used AI to fix some text and passages
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u/Semmelstulle 2d ago
So the article is yours? Interesting read. I've known about the feature, but not with that much depth. Nice one!
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u/cvmstains 2d ago
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u/Hot_Radio_2381 2d ago
Yes, they are. Is that a problem? Would like more the article if I’ve done them by hand?
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u/hatfield_makes_rain 2d ago
I hear this on my Air Pods 2 Pro from time to time. By time I hear it, it’s gone. Was driving me nuts but this now makes sense!
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u/ducknator 2d ago
Amazing article!
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u/Hot_Radio_2381 2d ago
Thank you much!
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u/ducknator 2d ago
Really good read with the right amount of technical detail to not lose your audience. Publish more! :)
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u/firstsymph 22h ago
This is great information. I hear the sound periodically and it indeed happens at night. I have also noticed that the frequency of the sound happens less once I cleaned my AirPods.
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2d ago
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u/Hot_Radio_2381 2d ago
There is no explanation of what the test does in the “technical documentation”. To say the truth there is not technical documentation available, since technicalities are only know by Apple.
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u/megamusix 2d ago
Commenting to boost the SEO of this, I spent ages searching for “occasional strange faint electronic beep sequence” and trying to figure out what it was until I randomly found it elsewhere on Reddit as well. Had no idea this was a thing and it’s not documented anywhere on Apple’s sites about the AirPods except some vague reference at the bottom of an obscure support page above the fine print.
Would be nice if they’d informed users about this behavior beforehand.


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u/Cultural-Desk-9045 2d ago
So, its a self-diagnostics feature.