By predicting, I mean they made a strange noise beforehand
In: 4
Burst of electromagnetic signals that would cause your phone to recognise its getting a call and ring, would interact with another electromagnetic object(speaker) and cause disturbance in jt!
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It’s the radio frequency being sent to your phone from the tower. You are hearing how long it takes for the call to reach your phone.
It’s interference from the phone. When the cellular tower signals the phone, the phone has to respond back transmitting to the tower a higher power and longer duration signal than the normal “ping/pong” they engage in when idle.
It’s this transmission from the phone to the tower (not the tower to the phone as a few other people said) to acknowledge the call that things like computer speakers can pick up. The speaker wires are usually unshielded and act like antennas, picking up the signal from the nearby phone (again from the phone, not the tower), and amplifying it along with the normal audio on that wire.
There was no “prediction”, the phone just takes a while to play a ringing sound for you — longer than it takes the speakers to pick up on the interference.
The phone didn’t directly drive the speakers or the speaker wires.
When you play music in a hifi system, some pretty small electrical signals get amplified up nice and big so they can be powerful enough to drive a speaker. When the signals are small, they’re very weak and they can easily be interfered with if they’re not shielded properly. Most hifi gear didn’t put much effort into this shielding.
When a call started to connect, your phone began a handshaking process with the cellular tower to say “ooh, this call is for me, thanks, I’ve got this set of amazing telephone powers that we can both use”. That part of the conversation had to be done at max power before the phone and cellular tower figured out how much power they both really needed.
This brief high power conversation would be big enough to interfere with the small, weak, pre-amplified signal and that got boosted up into the sound you would hear with your speakers.
Buzz-dit-de-dit-de-buzz yeah.
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