Acoustic Diode Only Lets Sound Travel in One Direction (Read: True Soundproofing) | Popular Science

Acoustic Diode Only Lets Sound Travel in One Direction (Read: True Soundproofing) | Popular Science: Composed of a structured arrangement of elastic spheres that ferry the sound through the material, the diode can be tuned to work only at certain frequencies or to downshift the frequencies moving through the material to lower frequencies as needed.