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A comment on Hackers send silent commands to speech recognition systems with ultrasound. Parent comment
https://en.wikipedia.org/wiki/Sound_from_ultrasound
The air acts as the demodulator though.
Shaping the ultrasound to modulate the eardrum sounds scary.
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https://en.wikipedia.org/wiki/Sound_from_ultrasound
The air acts as the demodulator though.
Shaping the ultrasound to modulate the eardrum sounds scary.