hearing aid


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hearing aid,

device used in some forms of deafness to amplify sound before it reaches the auditory organs. Modern hearing aids are electronic. They contain a tiny receiver and a transistor amplifier, and are usually battery powered. Some are small enough to fit into an arm of a pair of eyeglasses, or into the outer ear. The bone-conduction hearing aid, placed behind the ear, channels sound waves to the adjacent bony part of the skull, which then transmits the vibrations to the auditory nerve of the cochlea. The air-conduction hearing aid amplifies sounds and directs them into the ear toward the tympanic membrane. In recent years, a number of advancements have been made to hearing aids, improving the comfort, sensitivity, and aesthetic quality of the devices. Today, many hearing aids are customized to amplify only those noises (e.g., high frequency) that the user has difficulty hearing. Cochlear implants have been developed for use by certain totally deaf people. They consist of mechanical replacements for ineffective hair cells in the inner ear, which transform sound vibrations into electronic impulses that stimulate the auditory nerve.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hearing Aid

 

a sound-amplifying device used by persons afflicted with deafness or impaired hearing. The earliest hearing aids were purely acoustic devices, such as ear trumpets, whose narrow end was inserted into the ear. Modern hearing aids are electroacoustic devices consisting of a microphone, an amplifier, and an earphone. The sound enters the microphone, where it is converted into electric voltage. Amplified by electronic tubes or transistors, this voltage enters the earphone, where it is reconverted into amplified sound.

Hearing aids differ in design according to the nature of the auditory impairment. The standard earphone, inserted into the ear, transmits amplified sound into the external ear, and the bone conduction receiver, pressed against the mastoid process of the temporal bone, transmits sound into the inner ear.

Miniature hearing aids have a miniature earphone that is attached to an individually molded insert in the external ear. Some hearing aids are built into eyeglass frames or hair clips. Pocket hearing aids are manufactured as well. Hearing aids are prescribed by a physician and individually fitted in specialized laboratories after exhaustive hearing tests.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

hearing aid

[′hir·iŋ ‚ād]
(engineering acoustics)
A miniature, portable sound amplifier for persons with impaired hearing, consisting of a microphone, audio amplifier, earphone, and battery.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

hearing aid

a device for assisting the hearing of partially deaf people, typically consisting of a small battery-powered electronic amplifier with microphone and earphone, worn by a deaf person in or behind the ear
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
According to the charity, one in six people in Northumberland have some form of hearing loss, yet many struggle with their hearing aids and do not use them regularly.
This sleek, lightweight, fully programmed hearing aid is the outgrowth of the digital revolution that is changing our world.
However they proved to be unsuccessful because the short duration signal (click, tone-pip) interacted with the hearing aid circuitry in a way that introduced ringing and other artifacts [1].
One method will provide the control group with routine information regarding the care and use of hearing aids, which is the standard of care.
My dad had bought some hearing aids in October, and had nothing but trouble with them.
"The nearest audiology service is over 10 miles away, so having access to this level of support so close to home is vital to me and many other hearing aid users."
In all, the relative risk of being diagnosed with dementia, including Alzheimer's disease, within three years of a hearing loss diagnosis was 18 per cent lower for hearing aid users.
M2 PRESSWIRE-September 4, 2019-: The World Market for Hearing Aids (2019-2024): Growing Demand for Wireless & Smart Hearing Aids
This has long been an issue as most insurance companies do not cover hearing aids, therefore, there is a lack of private insurance coverage for them.
It is a study with documental analysis and development of the prospective, transversal and quantitative type, which had as clinical outcome the observation and analysis of aspects related to the use of hearing aids in subjects with UHL, such as, performance, benefit, satisfaction and time of use of the hearing aid.
To qualify for the Senior Citizens Hearing Aid Program, Oklahoma residents must be 60 years old, have limited income and have a 35-decibel hearing loss in their better ears.