- a compact electronic amplifier worn to improve one's hearing, usually placed in or behind the ear.[1920-25]
* * *Device that increases the loudness of sounds in the user's ear.Its principal components are a microphone, an amplifier, and an earphone. Hearing aids are increasingly smaller and less conspicuous, fitting behind the earlobe or within the ear canal. They have widely differing characteristics, amplifying different components of speech sounds for maximum comprehension by each wearer. Hearing aids with automatic volume control vary the amplification automatically with the input.
* * *▪ devicedevice that increases the loudness of sounds in the ear of the wearer. The earliest aid was the ear trumpet, characterized by a large mouth at one end for collecting the sound energy from a large area and a gradually tapering tube to a narrow orifice for insertion in the ear.Modern hearing aids are electronic. Principal components are a microphone that converts sound into a varying electrical current, an amplifier that amplifies this current, and an earphone that converts the amplified current into a sound of greater intensity than the original. Early models were quite large, but when transistors replaced amplifier tubes and smaller magnetic microphones became available in the 1950s, it became possible to build very small hearing aids, some of which were constructed to fit within the frames of eyeglasses and, later, behind the earlobe or within the external ear.Hearing aids have widely differing characteristics; requirements for suitable aids have been extensively investigated. The two characteristics of a hearing aid that most influence the understanding of speech are the amplification of the various components of speech sounds and the loudness with which the sounds are heard by the wearer. As regards the first characteristic, speech sounds contain many components of different frequencies, which are variously amplified by a hearing aid. The variation of amplification with frequency is called the frequency response of the aid. An aid need amplify sounds only within the range of 400 to 4,000 hertz, although the components of speech cover a much wider range. With regard to the second characteristic—the loudness with which sounds are heard—too loud a sound can be as difficult to understand as one that is too faint. The loudness range over which speech is understood best is wide for some users and narrow for others. Hearing aids with automatic volume control vary the amplification of the aid automatically with variations of the input.A binaural hearing aid consists of two separate aids, one for each ear. Such an arrangement can benefit certain users.
* * *
Look at other dictionaries:
hearing aid — hearing aids N COUNT A hearing aid is a device which people with hearing difficulties wear in their ear to enable them to hear better. Syn: deaf aid … English dictionary
hearing aid — n a small object which fits into or behind your ear to make sounds louder, worn by people who cannot hear well … Dictionary of contemporary English
hearing aid — hearing ,aid noun count a small piece of equipment that someone wears in their ear to help them hear … Usage of the words and phrases in modern English
hearing aid — ► NOUN ▪ a small amplifying device worn on the ear by a partially deaf person … English terms dictionary
hearing aid — n. a small, battery powered electronic device that amplifies sound waves, worn in or near the ear of a person who is partially deaf … English World dictionary
Hearing aid — Behind the ear aid In the ear aid … Wikipedia
hearing aid — An electronic amplifying device designed to bring sound into the ear; it consists of a microphone, amplifier, and receiver. SYN: hearing instrument. behind the ear h. h. that rests on the medial aspect of the pinna. completely in the … Medical dictionary
hearing aid — a device to improve the hearing. Simple passive devices, such as ear trumpets, are now rarely used. An analogue hearing aid consists of a miniature microphone, an amplifier, and a tiny loudspeaker. The aid is powered by a battery and the whole… … The new mediacal dictionary
hearing aid — noun 1. an electronic device that amplifies sound and is worn to compensate for poor hearing • Syn: ↑deaf aid • Hypernyms: ↑electronic device 2. a conical acoustic device formerly used to direct sound to the ear of a hearing impaired person • Syn … Useful english dictionary
hearing aid — UK / US noun [countable] Word forms hearing aid : singular hearing aid plural hearing aid a small piece of equipment that someone wears in their ear to help them to hear … English dictionary