New car interiors are laced with speakers and microphones to support increasingly complex audio systems and voice recognition features. Now Harman wants to put this hardware on the outside of cars as ...

Researchers have developed a battery-free sensor that reacts to sound waves, such as particular spoken words, producing enough vibrational energy to power an electronic device. The novel sensor would ...

Helium is a noble gas, and its colorless, odorless, and non-reactive properties make it extremely difficult to detect. A Chinese research team has developed a detector using sound waves that can ident ...