Radar can home in on the vibrations in one phone, even in a noisy environment
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Spies can eavesdrop on conversations by using radar to detect tiny vibrations in smartphones and employing artificial intelligence to accurately transcribe them. The trick even works in noisy rooms, as the radar homes in on the phone’s movement and is entirely unaffected by background hubbub.
Millimetre wave sensing is a form of radar that can measure movements of less than 1 mm by transmitting pulses of electromagnetic wave energy and detecting the reflected beams.
