The metal plate vibrates when the element expands and contracts, producing an audible sound. Frequency refers to a number of sound wave cycles, expressed in Hertz (Hz), which determines an audio ...

The microphone sensor, which captures audible sound signals, has emerged as a promising strategy. Its potential is contingent ...

and directional sound is no longer just stereo but above and behind you too. It's brilliantly effective, which is why it's a staple of TV shows and movies. If you're already an Audible subscriber ...