Modern
hearing aids work much like miniature telephones. They have microphones to pick up sound and amplifiers that increase the loudness in the
ear of the wearer.
A hearing aid is a sound amplifier - a device that increases the loudness of sounds in the ear of the wearer.
Perhaps the hearing of someone
you know is not as good as it was when
he was younger and he must now
wear a hearing aid.
 |
| Hearing Aid |
The
earliest hearing aid
was the ear trumpet. This
was a
trumpet- shaped instrument. Its
small end was placed to the ear. It simply gathered in sound and funneled it into the ear. Today
people who are hard-of hearing use small
transistor hearing aids instead of ear trumpets.
Modern
hearing aids are essentially
small battery-powered telephones. They
have microphones to pick up sound and
amplifiers to make sounds louder.
A button- sized
receiver fits in the ear or behind it, depending on the type of hearing defect, and sends sound vibrations to the hearing center. Sometimes,
hearing aids are so tiny that you hardly notice them.–Dick Rogers
No comments:
Post a Comment