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By Christian Chipouras

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1 By Christian Chipouras
Hearing Aids By Christian Chipouras

2 What is a Hearing aid? A hearing aid is a device used to regulate and amplify sound for the user Hearing aids are used by the partially deaf but not the completely deaf They can greatly improve the hearing of someone partially deaf but it cannot cure or help complete deafness. Placed either in and or around the ear They have 4 major parts: the microphone, battery, amplifier, and receiver

3 History Late 1700s: Early hearing aids consisting of a horn and a long thin tube that concentrated the sound to the ear were created. These were known as ear trumpets In the 19th century hearing trumpets were mass produced to aid the hearing impaired and partially deaf In 1898 the first carbon-type hearing aid was made due to the invention of the carbon microphone. In 1899 The first carbon-type hearing aid was patented by Miller Reese Hutchinson In 1920 vacuum tubes were added to the hearing aids to improve sound quality and clarity.

4 History cont. In 1952 the first hearing aid with an on/off switch was created. This new model was known as a transistor hearing aid In the 1990’s digital hearing aids were created allowing clearer and better hearing for the user 2000s- much smaller hearing aids were produced and are barely visible on the user.

5 The hearing aid today Today there are 5 Major types of hearing aids
Behind the ear hearing aids (BTE)-can be used for slight to nearly complete hearing loss On the ear hearing aids(also known as mini BTE’s)- less visible version of BTE’s In the ear hearing aids (ITE) –Very large and fits in ear In the canal hearing aids (ITC) -fits in ear canal used for mild hearing loss Completely in canal hearing aids (CIC)- used for mild hearing loss very difficult to adjust and maintain

6 The hearing aid today cont.
The newest hearing aids are small and self-adjust to allow clearer hearing. They also adjust when the user enters loud areas allowing the users inner-ear not to be harmed The newest hearing aids can wirelessly receive sounds from electronic devices such as computers and T.V.’s The digital hearing aid has become the main type of hearing aid used, as it is more versatile and produces clearer sounds

7 How it Works The hearing aid works by the microphone receiving the sound and converting the sound into electric impulses using the battery The hearing aid than sends the impulses to the amplifier which amplifies the impulses to the desired level and send them to the receiver. The receiver than converts the Impulses into amplified sound Waves which vibrate and stimulate the hair follicles in the inner ear to allow hearing

8 Limitations Hearing aids only amplify sounds making them useless to the deaf and nearly deaf Can have problems concentrating on single sounds allowing background noises to interfere They are visible and can cause irritation to the areas that are in contact with the device Loud noises can become very loud when amplified Many frequent hearing issues Problems and difficulties with adjustment

9 Future of the hearing aid
Complete wireless compatibility Better sound quality More efficient digital hearing aids Better sound distinction (between background noise and the noise trying to be heard) Ability to listen and to be compatible with cell phones and listening to music through the hearing aids Smaller and lighter versions

10 Bibliography Valente, Michael. Hearing Aids: Standards, Options, and Limitations. New York: Thieme, Web. 7 Oct 2012. Edwards, Brent. "The Future of Digital Hearing Aids." Trends in Amplification’s Special Issue on Digital Hearing Aids: 2-6. Web. 7 Oct <> ."  Dillon, Harvey. Hearing Aids. New York: Thieme, Web. 7 Oct "Hearing Aid." Wikipedia. Wikimedia Foundation, 28 Sept Web. 07 Oct <>. "Ear Wax Museum, a History of the Hearing Industry, Hearing Aids, Assistive Listening Devices, Etc." Ear Wax Museum, a History of the Hearing Industry, Hearing Aids, Assistive Listening Devices, Etc. Starkey Labs, n.d. Web. 07 Oct <>. Colin Blakemore and Shelia Jennett. “hearing aid.” The Oxford Companion to the Body 7 Oct <>.

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