iPhone 12 makes pulse noises all day long

Hi, my iPhone 12 makes pulse noises every hour or so.

It’s weird, it sounds like short static pulses (kind of like the signal in the movie Contact), ten pulses and then it stops, it does this every hour, all day long.

It is a quiet noise, I can’t hear it if there is noise in the room or outdoors.

It’s not like super annoying, but I was wondering what could it be and if it could be stopped.

Ah, it also happens if I’m using airpods, that’s how I noticed it the first time.