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This is such a cool experiment. Anything that involves sound like this is extremely interesting to me (I have a cochlear implant). Maybe I can hack it so I know when people are making payments :D

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Awh, Can you give a idea of how much nuisance such devices can cause you daily? Also is there a way to prevent cochlear implants from detecting these frequencies? (like do only some cochlear implants do this or most of them do)

I really wanna use tech like this sometimes in future, but I also wanna care about accessiblity.

I also have a cochlear implant; it doesn't allow me to hear ultrasonic frequencies -- in fact, my hearing range is still a subset of "normal."

I have one as well, and I've noticed that area proximity detectors (in hallways used to detect presence/motion) do get picked up and come through as loud pops.

How loud? These are audible to me without an implant (unless some are audible and some are inaudible)

You might be hearing a relay, which is itself switched by the proximity sensor.

There are also electricity poles with a strong EM field that cause a humming sound.

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