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Microphones too. Signage and TVs etc can emit ultrasonic beacons your devices can hear, with applications like tracking your viewing habits and your location.
by imglorp 6y ago
Microphones too. Signage and TVs etc can emit ultrasonic beacons your devices can hear, with applications like tracking your viewing habits and your location.
Ditto the proximity sensor: it's just a photocell and a simple room light could comprise a beacon. Flashing over, say 30hz would be invisible to us.
- guessbest 6y agoA lot of the cheap wifi security cameras already use sound to transmit data such as for pairing. https://setup.smartlink.pitneybowes.com/advancedTroubleshooting https://setup.smartlink.pitneybowes.com/advancedTroubleshoot...