Human Hearing Aid
Patients with a conductive defect which does
not respond fully to treatment may be helped with a hearing aid.
A hearing aid is an electronic,
battery-operated device that amplifies and changes sound to allow for improved
communication. Hearing aids receive sound through a tiny microphone, which then
converts the sound waves to electrical signals. The amplifier increases the
loudness of the signals and then sends the sound to the ear through a speaker
in an ear piece which fits into an outer ear canal. The electric signals are
converted back to sound waves.
A volume control on the aid usually operated
by turning a tiny wheel enables the level of incoming sound to be adjusted.
More powerful aids that amplify sound to a
greater degree are available. In these aids the microphone, amplifier and
battery are contained in a larger case worn on the body; the currents is
carried to the ear piece by a thin wire. Some people with conductive deafness
especially if there is an infection or discharge in the ear canal may be given
a bone condution hearing aid. This type of hearing aid may be fitted to a glass
frame or hair band.
Other devices
available for the hard-of-hearing include amplified telephone receivers,
flashing lights instead of door bells and telephone bells, vibrators that
respond to sound, head phone for television sets, teletype writers and guide
dogs for the deaf.
Noise pollution
The term noise is
derived from the Latin word Nausea
refering to the feeling of sickness in the stomach with an urge to vomit. Any
unpleasant and unwanted sound is considered as noise. It is one form of
pollution. Noise pollution can be defined as unwanted or offensive sounds that
unreasonably intrude into our daily activities. It is responsible for various
adverse effects. In recent years noise is recognized as a major pollutant on
par with other chemical pollutants of air, water and biosphere. Noise has many
harmful effects on man and the damage incurred is irreversible.
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