Microphones, from those in smartphones to hearing aids, are built specifically to hear the human voice—humans can't hear at levels higher than 20 kHz, and microphones max out at around 24 kHz, meaning ...

A study reported in the journal acta ethologica has recorded the use of ultrasound by amphibians for the first time in South America. It also describes the first documented case of the use of ...

American university researchers have developed a novel attack called "Near-Ultrasound Inaudible Trojan" (NUIT) that can launch silent attacks against devices powered by voice assistants, like ...

Recently, exposure to sounds with ultrasound (US) components has been shown to modulate brain activity. However, the effects of US on emotional states remain poorly understood. We previously ...

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From InConcert Amp'd to Inaudible frequencies, from wristband communication to using entire buildings as apps, here are five of the music apps that are changing how fans and bands treat live music… By ...