New audio tech uses ultrasound to create isolated pockets of sound, enabling private listening without headphones.

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

The oscillating variations in sound pressure (called the WAVEFORM of the sound) PROPAGATE in the form of a SOUND WAVE. See: ACOUSTIC IMPEDANCE, COMPRESSION, LAW OF SUPERPOSITION, PARTICLE VELOCITY, ...