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.

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.

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.

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
References in periodicals archive ?
At first glance, the ability to sense motion may seem irrelevant to hearing aid sound processing, but actually, our listening behavior varies depending on our motion state.
Many people simply cannot afford the high cost of a doctor's appointment and the high cost of the traditional hearing aid.
htm) issued a guidance that no longer required individuals over 18 years old to consult with a doctor before getting a hearing aid.
The global hearing aids market is segmented on the basis of Product Behind-The-Ear (BTE) Hearing Aids, Receiver-In-The-Ear (RIE) Hearing Aids, In-The-Ear (ITE) Hearing Aids, In-The-Canal (ITC) Hearing Aids, Completely-In-The-Canal (CIC) Hearing Aids; Technology (Conventional Hearing Aids, Digital Hearing Aids); End User (Audiology Clinics, ENT Clinics, Online Stores); and Region (North America, Latin America, Europe, Asia Pacific, and Middle East & Africa).
So before you even think of buying a hearing aid - make sure you're armed with this revolutionary new FREE Hearing Aid Guide.
Your hearing aid will be chosen according to your level of hearing loss.
The original legislation, House Bill 52, An Act to provide access to hearing aids for children, was co-sponsored by Mr.
Perhaps the best quality-to-price ratio in the hearing aid industry"- Dr.
Working in partnership with local health boards and audiology departments, the support sessions will be run largely by volunteers, most of whom will be hearing aid users themselves.
In selection, numeric targets for hearing aid electro-acoustic performance are calculated and appropriate hearing aids are chosen.
A probe then found four other patients had been prescribed with one type of hearing aid, but were supplied with a different type.
John Walters, 64, was fitted with the pioneering hearing aid at specialist Geraint Davies' Llandudno offices.