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coil noise is the hard drive noise of the SSD era; when i was a child you could hear a computer's accesses to persistent storage, nowadays the predominant noise seems to come from CPU power state transitions (peak to average power ratio is big for a mostly idle modern CPU)
USB buzz is worse; anywhere with a USB and audio ground loop ends up with some horrible 1kHz whine that varies depending on USB traffic. And suddenly you can hear the activity of your USB flash drive again. This stuff is everywhere, even professional TV production. USB2 sucks.
i had a 12V car usb charger for my iphone and when i also connected its headphone port to the car's aux input it would make a horrid noise proportional to the instantaneous power draw; everything from LTE modem to touching the screen to iOS animations made different horrid sounds
I get the same except it tracks the engine RPM, which I can only assume is some weird harmonic noise from the alternator.
I have a couple of bags of cheap audio isolation transformers, they come in handy a lot. Also considering modding my soundcard to use external power (e.g. 8v then LDO it) as USB 5v is often shockingly noisy
I'm wondering if USB's EMI leakage can be used as a side channel to learn about actual data transferred
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