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The Physics of Hearing Aids
Transcript of The Physics of Hearing Aids
The Physics of
there are an estimated Americans with hearing loss
Belham N. Andy (12) The Practical Physics of Hearing Aids, 305, 1569-1570
American Speech Language- Hearing Association (1997) Retreived May21/2012
You can lose your hearing in 1 of 2 ways..
Coductive hearing loss
Sensorineural hearing loss
when sound doesn't get to your cochlea
When Cochlea themselves are damaged
Hearing loss starts to decrease the ability to hear sounds above approx. 2000 Hz.
A Little Bit About the Ear
Sound travels through opening of outer ear and vibrates eardrum
3 small bones carry to which stimulates hair cells that send signals to your brain
the first trial of hearing aids were just microphones for everyone in the room
next they tried walkie talkies but there was a lack of privacy
Effects of people aged 55 and over
improved the quality of life
So much variety!
Behind the ear
Receiver in the canal
The first hearing aids were enormous trumpet shaped
Alexander Graham Bell electronically amplified sound using a carbon microphone and battery this was adapted in the manufacturing
In 1886, Thomas Edison invented the carbon transmitter, which changed sounds into electrical signals that could travel through wires and be converted back into sounds
For the estimated 28 million Americans with hearing loss, life is a series
of missed opportunities
Frustrated friends and family members will just give up on communicating altogether
Hearing aids are fairly simple devices, consisting of four basic parts:
A microphone picks up sound from the environment and converts it into an electrical signal,
which it sends to the amplifier.
An amplifier increases the volume of the sound and sends it to the receiver.
A receiver/speaker changes the electrical signal back into sound and sends it into the ear.
Then those impulses are sent to the brain.
A battery provides power to the hearing aid
The Digital Hearing Aid