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Microphones are perhaps the most common electronic sensor in the world, with an estimated 320 million listening for our commands in the world’s smart speakers. The trouble is that they’re capable of hearing everything else, too. But now, a team of University of Michigan researchers has developed a system that can inform a smart home or listen for the signal that would turn on a smart speaker without eavesdropping on audible sound. The key to the device, called PrivacyMic, is ultrasonic sound at frequencies above the range of human hearing. Running dishwashers, computer monitors, even finger snaps, all generate ultrasonic sounds, which have a frequency of 20 kilohertz or higher. We can’t hear them but dogs, cats and PrivacyMic can.

United statesYasha iravantchiMayank goelKaran ahujaChris harrisonCarnegie mellon universityUm office of technologyUniversity of michiganAlanson sampleRaspberry pi basedYum officeUtilizing inaudible frequenciesPrivacy preserving daily activity recognitionHuman factorsCarnegie mellonஒன்றுபட்டது மாநிலங்களில்