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Bluetooth | How do Wireless Earbuds Work

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Bluetooth is literally indistinguishable from Magic give an iPhone 7 and some earbuds to a Victorian child and watch them get burned at the stake just for holding that stuff. Like we’re for real just here on a big rock with sticks and water and made Bluetooth from that what the fliick is going on here. Well it’s actually quite simple!

No it's not simple. That was a lie :) 

This stuff is whack…. To begin your phone and earbuds communicate with light not this light not this light either. It’s like a freaky sort of light on the electromagnetic spectrum the human eye can see 400 to 600 nanometers zoom out and you’ll notice the human eye is actually blind the light that Bluetooth uses is over here specifically 121 mm through 124 mm.

Not only is this light invisible to the human eye but the waves are so long that it can pass through walls like how visible light passes through glass cool but.

How does light allow me to listen??

Light that show how do earbuds work with light
Light that show how do earbuds work with light

How does light allow me to listen to Shakira 1s and 0s. Lets say 121 mm is purple and 124 mm is green if your phone wants to send a one to your earbuds your antenna turns purple the antenna on the earbuds sees this and tells the microchip in the earbuds hey it’s purple and then the microchip writes down to one if the phone wants to send a zero the antenna turns green and the same thing happens this happens about a million times a second okay so now we know how to communicate uh but this brings up about a million problems.

For Example

If my bro is next to me listening to Taylor Swift while I’m hearkening to the songs of Shakira like a real man how does my earbuds know to ignore the Taylor Swift and only play Shakira?

You and your bro watching Shakira and Taylor swift on different channels
You and your bro watching Shakira and Taylor swift on different channels

Well this problem has a couple of solutions first of all it’s not actually just purple and green there are 79 separate c s or channels within the range of purple and green each channel has its own specific wavelength for 1 and 0.

Mobile phone sending signal to earbuds green light
Mobile phone sending signal to earbuds green light

So while you might be in channel 37 your bro could be in channel 73 but what if there are 158 different phones and earbuds playing music in the same place two for each Channel..

First of All

The be absolutely scandalous but still your earbuds would limp along playing the one and only Shakira and no one else is garbage how well this is when we finally talk about how your headphones and phone pair think of your earbuds. As being a lock when you click the pair button on set earbuds it actively sends out a key through its antenna then in your phone settings you can see all the keys being sent out and your phone can say key number 37948. I Choose You what then happens is at the beginning of each package of ones and zeros your earbuds change.

Phone pairing with earbuds with a key
Phone pairing with earbuds with a key

Its lock and using the old key it gives a new key to your phone so your earbuds technically can hear your Bros Taylor Swift playing if it’s in the same channel but since it doesn’t have the correct key it not only ignores it completely. But it actually has no idea how to read it because the key is an encryption for the rest of the message.

Now another question arises

Couldn’t someone just intercept and then decrypt of all of what’s being transmitted between your phone and headphones?

Someone is trying to hack your phone and earbuds signals
Someone is trying to hack your phone and earbuds signals

Well some of the engineers probably watched Little Einstein’s as a kid, Because there’s a genius solution to this problem your phone and earbuds don’t us to stay in one channel they do something called frequency.

Hopping they hop around from channel to channel and do this about 1,600 times every second an e dropper might be able to listen.

Listen

For a teeny fraction of a second but then you change channels and they would have no way of knowing what channel you went to but then how does both your phone and earbuds know what channel to go to well when your phone initially connects and says key number 37948.

I choose you within that message it picks out a sequence and sends that information encrypted over to your headphones before any sound is even playing this way your phone and headphones are the only things that know what channel they’re going to go to next.

So yeah not too complicated.

Now you should be able to take stick, rocks and water and create some Bluetooth. 😂

Sticks, rocks and water
Sticks, rocks and water
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