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Scientist builds bracelet that jams microphones on smart speakers like Alexa and Siri with ultrasonic signals to stop them listening in on conversations

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Daily Mail
February 18, 2020

Smart speakers, like Amazon’s Alexa and Apple’s Siri, have come under fire over the past few years for ‘listening’ to its owner’s conversations.

Now, a team of scientists believe they have developed the ultimate weapon to block the devices’ spying abilities – a wearable that jams the microphone.

Dubbed the ‘bracelet of silence’, the chunky bracelet is fitted with 23 speakers around it that emit ultrasonic signals that drown out any speech of the wearer.

While these ultrasonic signals are undetectable to human ears, they leak into the audible spectrum after being captured by the microphones, producing a jamming signal inside the microphone circuit disrupts voice recordings.

The team chose to design the technology into a bracelet, because it uses the wearer’s natural gestures that occur while speaking, gesturing or moving around to blur out the blind spots.

The bracelet was designed by a team at the University of Chicago, which can also jam the microphones on a smart assistant.

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This article was posted: Tuesday, February 18, 2020 at 4:44 am

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