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Research shows snoops can decipher keystrokes during Zoom calls
(techxplore.com)
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this post was submitted on 08 Aug 2023
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I'd assume this only works with non-normalized stereo audio. Just flip mono audio on and normalize, then you can't really tell which key is pressed, or if you're talking at the PC or from the living room.
There was previous (german?) research that was able to do this from just well-recorded sound.
HRTF etc. wasn't required.
https://www.newscientist.com/article/dn7996-keyboard-sounds-reveal-their-words/ (Paywall, apologies, and it's US, I couldn't find the german one)