Create a focused speaker so your music targets only the listener. That demodulates at 40 kilohertz, with an H-bridge and ...
When [Electron Impressions] used a powerful ultrasonic array to project a narrow beam of sound toward a target, he described ...
Floating world: a 3D globe created by the University of Sussex display. (Courtesy: Eimontas Jankauskis) An ultrasound-powered, 3D visual display that can also produce audible sound and holograms that ...
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