Hearing Impairment - detailed notes organized under slide titles :)

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2 Jun 2011
School
Department
Course
Hearing impairment
-helen keller said that deafness was harder to live with than blindness
-blindness cuts you off from the visual world but deafness cuts you off from people which is a lot
harder to live with
-if you ask a typical person
most would say they would
rather be deaf than blind
Loudness, pitch, timbre graph
-sound is energy created
through vibrations
-increase in amplitude = louder
the sound
-increase in frequency = higher
pitch
-doubling frequency 
up 1 octave
-we have a range of about 20 –
20 000 Hz
-timbre example: middle C on a
piano compared to middle C on
a violin compared to a vocalist
singing middle C all the same note musically but since they are created differently they
produce a different sound ex: vibrating metal vs string vs vocal chords
The structure of the human ear
-sound vibrates ear drum transferred through 3 little bones pass on movement into the
cochlea (which is full of fluid) fluid is pushed and little hair cells move nerve endings are
stimulated passes signal to
auditory nerve then to auditory
cortex
-if you have a hole in the ear drum, it
will leak properties will not be the
same
-eustachian tube: balances pressure
between the inner ear and outside
world
Hearing thresholds of a person with
hearing in the normal
range
-most people (even
those with hearing disorders) can
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