University of Chicago researchers have built an experimental bracelet that uses ultrasonic broadcasts ... and it's estimated that you could build this anti-mic bracelet for roughly $20.

University of California, Berkeley, physicists have used graphene to build lightweight ultrasonic loudspeakers and microphones, enabling people to mimic bats or dolphins’ ability to use sound to ...

Current ultrasonic emitters use piezoelectric ... Qin Zhou has been working the electronic circuitry to build a microphone with a similar graphene diaphragm. When Zhou explained this work to ...

[Jason] has continued to plug along with his sonar build and recently showed up a monostatic active sonar using a piezo element and microphone ... He has ditched the ultrasonic module seen ...

The wearable is crammed with 24 separate transducers that emit ultrasonic ... it is critical to build tools that protect users against the potential compromise or misuse of microphones in the ...

The microphone has been built by scientists of University of California Berkeley physicists. Scientists used graphene to build lightweight ultrasonic loudspeakers and microphones, enabling people ...

"Voice-activated systems are everywhere, so now it is important to build defenses against ... researchers and transmitted from ultrasonic speakers, but the microphone -- the receiver of the ...

For [Jianjia Ma]’s QingStation, he decided to build another type of wind sensor: An ultrasonic anemometer ... GPS, and a microphone for environmental sounds. The fact that none of the sensors ...

A new device promises to do just that, placing a check on your Amazon Echo’s always-on microphones ... real engineering to build. The device features seven individual ultrasonic speakers that ...