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sound frequencies. |
This person will come into |
the Massachussetts Eye and Ear |
Infirmary, for example, |
and complain to the doctors |
and audiologists there when |
the hearing loss becomes |
noticeable, when they have a |
problem understanding speech. |
Hearing loss is |
intimately entwined |
with our perception and |
understanding of speech. |
And so when people have |
problems understanding speech, |
they often seek medical advice. |
Now, the most important |
frequencies for those in speech |
are between about |
300 and 4,000 Hertz. |
So you can see this person's |
hearing loss is clearly |
getting into the |
speech range, and they |
may have problems discerning |
the more high frequency |
parts of speech. |
So what are those? |
So typically vowels, which |
have the formants that we talk |
about, have very low |
frequency, so something |
like ahhh and oooh. |
They are very low frequencies. |
But I think if you could read |
this diagram a little better, |
you'd understand that |
high-pitched sounds |
like the "sss" sound |
of an s, or something |
that has an abrupt |
onset, like a "t", |
has a lot of high |
frequencies in that sound. |
And so those are going to be |
the first types of speech sounds |
that are hard to |
understand for the person |
with the impaired graph |
on the top slide there. |
Now at first, you |
might say, well, |
what we should do is get a |
hearing aid that amplifies |
the frequencies that |
are in loss area OK. |
So to do that, |
you'd have to have |
a pretty sophisticated |
hearing aid. |
You'd have to, for |
each sound frequency, |
dial in the exact |
amount of amplification. |
And hearing aids are |
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