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Don’t Skype & Type! Acoustic Eavesdropping in Voice-Over-IP

https://www.math.unipd.it/~dlain/papers/2017-skype.pdf

Yes, countermeasures, such as playing other sounds around those frequencies and/or filtering the microphone at those frequencies would be interesting to explore. Filtering the mic seems the less annoying from a user perspective!

Most streamers, myself included, use a filter called a noise gate, which requires the volume of the mic reach a certain threshold before being broadcast. This filters out the majority of background noise on the stream.

Perhaps accidentally, a yubikey or something similar would avoid this attack.