hearing aid (redirected from Deaf aid)

aid (ād) help or assistance; by extension, applied to any device by which a function can be improved or augmented, as a hearing aid.

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first aid  the initial emergency care and treatment of an injured or ill person before definitive medical and surgical management can be secured.

hearing aid  a device that amplifies sound to help deaf persons hear, often specifically a device worn on the body.

pharmaceutical aid  see under necessity.

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hearing aid

n.

A small electronic apparatus that amplifies sound and is worn in or behind the ear to compensate for impaired hearing.

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hearing aid,

an electronic device that amplifies sound used by people with impaired hearing. The device consists of a microphone, a battery power supply, an amplifier, and a receiver. The microphone receives sound waves directed toward the person with hearing loss, then converts the sound waves to electrical impulses that are amplified with the aid of the power supply, and the receiver converts the electrical impulses back into sound vibrations. Newer, programmable hearing aids can be customized on the basis of the characteristics of an individual's hearing loss.

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hearing aid,

n an electronic device used to amplify and shape waves of sound entering the external auditory canal.

hearing aid, behind-the-ear,

n an electronic device, situated over the ear, for amplifying and shaping sound waves entering the external auditory canal.

hearing aid, eyeglass model,

n an electronic device, attached to the eyeglasses' thickened temple bar, for amplifying and shaping sound waves entering the external auditory canal.

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hearing

the sense by which sounds are perceived, by conversion of sound waves into nerves impulses, which are then interpreted by the brain. Also, the capacity to perceive sound. The organ of hearing is the ear, which is divided into three sections, the outer, middle and inner ear. Each plays a special role in hearing. Connecting the middle ear with the nasopharynx is the pharyngotympanic canal, through which air enters to equalize the pressure on both sides of the tympanic membrane (eardrum).

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hearing aid

an instrument to amplify sounds for the hard of hearing. These have been fitted to dogs, but are not normally offered in veterinary practice.

hearing tests

are difficult to administer and interpret in any other than laboratory-trained animals or without specialized electronic equipment such as an impedance audiometer or electroencephalograph with which auditory cortical evoked responses can be measured.

hearing dog

a dog trained to respond to sounds such as a telephone ring or door bell; used to assist hearing impaired humans.

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hearing aid

Audiology A battery-powered electro-acoustic device that brings amplified sound to the ear to improve hearing, generally worn in the ear. See Hearing loss.