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This is a glossary of medical terms related to communication disorders which are psychological or medical conditions that could have the potential to affect the ways in which individuals can hear, listen, understand, speak and respond to others.
Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby to hear. Headphones are also known as earphones or, colloquially, cans. Circumaural and supra-aural headphones use a band over the top of the head to hold the speakers in place. Another type, known as earbuds or earpieces consist of individual units that plug into the user's ear canal. A third type are bone conduction headphones, which typically wrap around the back of the head and rest in front of the ear canal, leaving the ear canal open. In the context of telecommunication, a headset is a combination of headphone and microphone.
An instrument amplifier is an electronic device that converts the often barely audible or purely electronic signal of a musical instrument into a larger electronic signal to feed to a loudspeaker. An instrument amplifier is used with musical instruments such as an electric guitar, an electric bass, electric organ, synthesizers and drum machine to convert the signal from the pickup or other sound source into an electronic signal that has enough power, due to being routed through a power amplifier, capable of driving one or more loudspeaker that can be heard by the performers and audience.
A hearing aid is a device designed to improve hearing by making sound audible to a person with hearing loss. Hearing aids are classified as medical devices in most countries, and regulated by the respective regulations. Small audio amplifiers such as personal sound amplification products (PSAPs) or other plain sound reinforcing systems cannot be sold as "hearing aids".
Bone conduction is the conduction of sound to the inner ear primarily through the bones of the skull, allowing the hearer to perceive audio content without blocking the ear canal. Bone conduction transmission occurs constantly as sound waves vibrate bone, specifically the bones in the skull, although it is hard for the average individual to distinguish sound being conveyed through the bone as opposed to the sound being conveyed through the air via the ear canal. Intentional transmission of sound through bone can be used with individuals with normal hearing — as with bone-conduction headphones — or as a treatment option for certain types of hearing impairment. Bone generally conveys lower-frequency sounds better than higher frequency sounds.
A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience. In many situations, a sound reinforcement system is also used to enhance or alter the sound of the sources on the stage, typically by using electronic effects, such as reverb, as opposed to simply amplifying the sources unaltered.
A bone-anchored hearing aid (BAHA) is a type of hearing aid based on bone conduction. It is primarily suited for people who have conductive hearing losses, unilateral hearing loss, single-sided deafness and people with mixed hearing losses who cannot otherwise wear 'in the ear' or 'behind the ear' hearing aids. They are more expensive than conventional hearing aids, and their placement involves invasive surgery which carries a risk of complications, although when complications do occur, they are usually minor.
The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon. One plate is very thin and faces toward the speaking person, acting as a diaphragm. Sound waves striking the diaphragm cause it to vibrate, exerting a varying pressure on the granules, which in turn changes the electrical resistance between the plates. Higher pressure lowers the resistance as the granules are pushed closer together. A steady direct current is passed between the plates through the granules. The varying resistance results in a modulation of the current, creating a varying electric current that reproduces the varying pressure of the sound wave. In telephony, this undulating current is directly passed through the telephone wires to the central office. In public address systems it is amplified by an audio amplifier. The frequency response of most carbon microphones, however, are limited to a narrow range, and the device produces significant electrical noise.
Adaptive feedback cancellation is a common method of cancelling audio feedback in a variety of electro-acoustic systems such as digital hearing aids. The time varying acoustic feedback leakage paths can only be eliminated with adaptive feedback cancellation. When an electro-acoustic system with an adaptive feedback canceller is presented with a correlated input signal, a recurrent distortion artifact, entrainment is generated. There is a difference between the system identification and feedback cancellation.
A contralateral routing of signals (CROS) hearing aid is a type of hearing aid that is used to treat a condition in which the patient has no usable hearing in one ear and minimal hearing loss or normal hearing in the other ear. This is referred to as single sided deafness.
Electric acoustic stimulation (EAS) is the use of a hearing aid and a cochlear implant technology together in the same ear. EAS is intended for people with high-frequency hearing loss, who can hear low-pitched sounds but not high-pitched ones. The hearing aid acoustically amplifies low-frequency sounds, while the cochlear implant electrically stimulates the middle- and high-frequency sounds. The inner ear then processes the acoustic and electric stimuli simultaneously, to give the patient the perception of sound.
An extended-wear hearing aid is a type of hearing aid that is placed deep in the ear canal and can be worn for several months at a time without removal. This type of hearing aid is primarily suited for people who have mild to moderately severe hearing loss. This new hearing aid concept was invented by Adnan Shennib, founder of InSound Medical, Inc.
An assistive listening device (ALD) is part of a system used to improve hearing ability for people in a variety of situations where they are unable to distinguish speech in noisy environments. Often, in a noisy or crowded room it is almost impossible for an individual who is hard of hearing to distinguish one voice among many. This is often exacerbated by the effect of room acoustics on the quality of perceived speech. Hearing aids are able to amplify and process these sounds, and improve the speech to noise ratio. However, if the sound is too distorted by the time it reaches the listener, even the best hearing aids will struggle to unscramble the signal. Assistive listening devices offer a more adaptive alternative to hearing aids, but can be more complex and cumbersome.
Miracle-Ear, Inc. is a hearing aid company consisting of a network of franchised and corporately-owned retail locations. The company is a subsidiary of Amplifon, the worldwide distributor of hearing aids based in Italy. Miracle-Ear's U.S. headquarters are located in Minneapolis, Minnesota. As of 2023 it has more than 1,500 locations in the United States, and it is the best-known hearing aid brand in the U.S. In 2014, the company added several locations in Canada, with plans to open more Canadian outlets. According to the company, Miracle-Ear outlets offer free hearing tests and consultations, and the hearing aids include a risk-free 30-day trial period plus service, warranty, and lifetime after-care.
The first hearing aid was created in the 17th century. The movement toward modern hearing aids began with the creation of the telephone, and the first electric hearing aid was created in 1898. By the late 20th century, the digital hearing aid was distributed to the public commercially. Some of the first hearing aids were external hearing aids. External hearing aids directed sounds in front of the ear and blocked all other noises. The apparatus would fit behind or in the ear.
SoundBite Hearing System is a non-surgical bone conduction prosthetic device that transmits sound via the teeth. It is an alternative to surgical bone conduction prosthetic devices, which require surgical implantation into the skull to conduct sound.
Real ear measurement is the measurement of sound pressure level in a patient's ear canal developed when a hearing aid is worn. It is measured with the use of a silicone probe tube inserted in the canal connected to a microphone outside the ear and is done to verify that the hearing aid is providing suitable amplification for a patient's hearing loss. The American Speech–Language–Hearing Association (ASHA) and American Academy of Audiology (AAA) recommend real ear measures as the preferred method of verifying the performance of hearing aids. Used by audiologists and other hearing healthcare practitioners in the process of hearing aid fitting, real ear measures are the most reliable and efficient method for assessing the benefit provided by the amplification. Measurement of the sound level in the ear canal allows the clinician to make informed judgements on audibility of sound in the ear and the effectiveness of hearing aid treatment.
TV Ears is an American, privately held audio technology company that specializes in voice clarifying television products for the hearing impaired. It was founded in April 1998 by George Dennis. They are located in Spring Valley, California, where they house the North American distribution center, support, and sales teams, while employing approximately 50 people. TV Ears serves hearing impaired customers throughout the world, with their predominant markets being in the United States, Canada, and Europe.
Treatment depends on the specific cause if known as well as the extent, type, and configuration of the hearing loss. Most hearing loss results from age and noise, is progressive, and irreversible. There are currently no approved or recommended treatments to restore hearing; it is commonly managed through using hearing aids. A few specific types of hearing loss are amenable to surgical treatment. In other cases, treatment involves addressing underlying pathologies, but any hearing loss incurred may be permanent.
The Over-the-Counter Hearing Aid Act of 2017 was a law passed by the 115th United States Congress as a rider on the FDA Reauthorization Act of 2017. It created a class of hearing aids regulated by the Food and Drug Administration (FDA) available directly to consumers without involvement from a licensed professional. Regulations for this new class of hearing aid are expected to be released by the end of 2020.
References
- ↑ Mann, Eric A., M.D., Ph.D., “Hearing Aids and Personal Sound Amplifiers: Know the Difference”, U.S. Food and Drug Administration Consumer Updates website, Oct. 20, 2009. Retrieved 2013-05-23.
- ↑ Neil DiSarno, an audiologist and chief staff officer of audiology at the American Speech-Language-Hearing Association in Rockville, Md. “Pros and Cons of Inexpensive Hearing Aids Called PSAPs”
- 1 2 Mann, “Guidance for Industry and FDA Staff: Regulatory Requirements for Hearing Aid Devices and Personal Sound Amplification Products”, U.S. Food and Drug Administration website, Feb. 25, 2009. Retrieved 2013-05-23.
- 1 2 3 Beck, Melinda, “Testing, Testing...Can You Hear Better Now?”, The Wall Street Journal, Sept. 10. 2012. Retrieved 2013-05-23.
- ↑ "Reading Glasses — Types, Styles, and Much More!". 14 October 2013.
- ↑ Beck, Melinda, “Getting an Earful: Testing A Tiny, Pricey Hearing Aid”, The Wall Street Journal, Jan. 29, 2008. Retrieved 2013-05-23.
- ↑ Strom, Karl, “The PSAP Dilemma” Archived 2013-06-24 at archive.today , The Hearing Review, June 2010. Retrieved 2013-05-29.,
- ↑ Ramachandran, Virginia, Stach, Brad, “Just Making Hearing Aid Less Expensive Doesn't Encourage Earlier Use” Archived 2013-06-24 at archive.today , The Hearing Review, May 2011. Retrieved 2013-05-28.
- 1 2 Kochkin, Sergei, Ph.D., “MarkeTrak VIII: Utilization of PSAPs and Direct-Mail Hearing Aids by People with Hearing Impairment” [ permanent dead link ], The Hearing Review, June 2010; Volume 17, Number 6. Retrieved 2013-05-23.