Directing sound to a specific location is difficult because of how sound waves behave. As vibrations move through the air, ...

What if you could listen to music or a podcast without headphones or earbuds and without disturbing anyone around you? Or ...

Sound waves can reflect off surfaces ... through the auditory nerve our brain interprets these signals as sound Trace 1. small amplitude, low frequency → a quiet, low pitch sound.

The approach uses high-frequency sound waves, usually in the megahertz (radiofrequency ... hyperspectral imaging applications for detecting trace gases, organic compounds and other materials.