Using your phone’s microphone to track possible COVID-19 exposure

Signals sent and received from cell phone microphones and speakers could help warn people when they have been near someone who has contracted COVID-19, researchers say.
In a new paper, researchers described a system that would generate random, anonymous IDs for each phone, automatically send ultrasonic signals between microphones and speakers of phones within a certain radius, and use the information exchanged through this acoustic channel for contact tracing.

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