The ear drum
The ear drum is a thin, light and elastic membrane. Its surface is around 60mm², and its thickness is around 100 microns.
This membrane is excited by an acoustic wave, guided and amplified by the ear canal.
Informations[1]The ear drum is comparable to a microphone membrane.
The ear drum creates what is called a coupling (or an acoustical-mechanic transduction) (see section 3.1 for a more detailed explanation)
The ear drum transforms acoustic pressure
and volume velocity
, where
is the canals diameter, and
the acoustic velocity (see definitions in section 1.2) in the ear canal into mechanical force and velocity through the middle ear to the inner ear.
