All sounds that are distracting,
annoying, or harmful to everyday activities such as work, rest, entertainment, study and
so forth are regarded as noises. In fact, any sound judged by the recipient as undesirable
can be considered as a noise.
Whether or not a sound is
undesired by a person will depend on a number of factors, e.g.
(d) Variation with time.
(e) Time of occurrence.
(f) Information content.
(g) Origin of the sound.
(h) Recipient's state of mind and
(i) Background noise level.
In general, the effects of noises
(a) Hearing Loss
Exposure to high noise levels
causes hearing loss. This loss of hearing may be temporary, permanent, or a combination of
both. Temporary hearing loss, also called Temporary Threshold Shift (TTS),
results from exposure to short-term loud noises. As time passes, temporary hearing loss
will disappear. However, if the human ear is not given the opportunity to recover,
permanent hearing loss or Permanent Threshold Shift (PTS) will result
because of the destruction of parts of the ear. Permanent hearing losses cannot be