acoustic transmissivity meaning

• [Electronics]
  Also called acoustic transmitivity. The ratio et/ei, where et is the sound energy transmitted by a medium, and ei is the incident sound energy reaching the surface of the medium. Acoustic transmissivity is proportional to the angle of incidence.
  

• transmissivity:     or transmissivˈit ...
• acoustic:    Adjective: acousti ...
• acoustic absorption:    [Electronics]The a ...