Abstract
The ear transforms soft mechanical vibration of air particles into electrical signals, which reach the appropriate part of the cerebral
cortex for processing by means of auditory nerves. The cerebellum interprets these complicated signals by determining pitch, tone,
loudness, and placement of the sound source. We deduced the wave equation. The outer ear consists of the auricle and the external
auditory canal. It is used to conduct air vibrations. Its bottom is closed by the eardrum, which absorbs sound vibrations. The waves
can be classified in two big categories: longitudinal waves and transversal waves. Comparing the two forms, we can conclude that the
phase velocity of longitudinal waves is always higher. Is a very interesting the dependence of sound quality on physical parameters.
Loudness mainly depends on the sound pressure, but the duration and spectrum of the sound also influence the development of loudness
sensation. The sense of pitch depends mainly on frequency, but shows a slight dependence on sound pressure and duration. When
an ear is exposed to two or more different sounds, one can mask the other in the traditional sense.