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 drivers in place. Another type, known as earbuds or earpieces, consists 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 a headphone and microphone.
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".
A hearing test provides an evaluation of the sensitivity of a person's sense of hearing and is most often performed by an audiologist using an audiometer. An audiometer is used to determine a person's hearing sensitivity at different frequencies. There are other hearing tests as well, e.g., Weber test and Rinne test.
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 even if the ear canal is blocked. 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. Bones are generally more effective at transmitting lower-frequency sounds compared to higher-frequency sounds.
Audiology is a branch of science that studies hearing, balance, and related disorders. Audiologists treat those with hearing loss and proactively prevent related damage. By employing various testing strategies, audiologists aim to determine whether someone has normal sensitivity to sounds. If hearing loss is identified, audiologists determine which portions of hearing are affected, to what degree, and where the lesion causing the hearing loss is found. If an audiologist determines that a hearing loss or vestibular abnormality is present, they will provide recommendations for interventions or rehabilitation.
Unilateral hearing loss (UHL) is a type of hearing impairment where there is normal hearing in one ear and impaired hearing in the other ear.
EQT AB is a Swedish global investment organization founded in 1994. Its funds invest in private equity, infrastructure, real estate, growth equity, and venture capital in Europe, North America, and Asia Pacific.
Signia can refer to more than one notable item:
Sonova Holding AG is an internationally active Swiss group of companies headquarteres in Stäfa that specializes in hearing care. The Sonova group operates through its core business brands Phonak, Unitron, Hansaton, Advanced Bionics, AudeoNova and Senheiser. It is one of the largest providers in the sector worldwide. The group and its brands hold 24% of the global hearing aid market in sales. As of 11 September 2022, Sonova was a component of the Swiss Market Index.
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.
Sivantos, Inc. is the United States affiliate of Sivantos Group, which maintains a global headquarters in Singapore. Sivantos Group is one of the world's leading manufacturers of hearing aids. They serve hearing care professionals in more than 120 countries, offering hearing aids branded Siemens, Audio Service, Rexton, and A&M. Sivantos, Inc., and is located in Piscataway, NJ, where approximately 500 employees work in manufacturing, research and development, sales, marketing finance, and customer care.
Hearing, or auditory perception, is the ability to perceive sounds through an organ, such as an ear, by detecting vibrations as periodic changes in the pressure of a surrounding medium. The academic field concerned with hearing is auditory science.
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.
Widex A/S is the world’s sixth largest hearing aid manufacturer. In close collaboration with international audiological researchers and specialists, the company has developed a wide range of digital hearing aids. They introduced the world's first commercially available 100% digital in-the-ear hearing aid in 1995 based on the research model developed by Oticon that same year.
Beltone is a hearing aid company founded in 1940, headquartered in Chicago, Illinois, United States. Beltone products are sold in the United States, Canada, and over 40 countries across the globe. The Beltone Hearing Care Foundation, a 501(c)(3) charitable organization, was established in 2014 with the stated intent of donating hearing instruments to those in need.
Miracle-Ear, Inc. is a hearing aid and hearing care company consisting of a network of franchised and corporately owned retail locations. The company is a subsidiary of Amplifon, the worldwide leader in hearing care and hearing aid retail based in Milan, 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.
Starkey Hearing Technologies is an American privately owned company based in Eden Prairie, Minnesota that makes hearing aids, and is one of the largest hearing aid manufacturers in the world. As of 2019, the company had more than 5,000 employees in 24 facilities, serving more than 100 markets worldwide, and is the only American-owned global hearing aid manufacturer.
Cartilage conduction is a pathway by which sound signals are transmitted to the inner ear. In 2004, Hiroshi Hosoi discovered this pathway and named “cartilage conduction”. Hearing by cartilage conduction is distinct from conventional sound-conduction pathways, such as air or bone, because it is realized by touching a transducer on the aural cartilage and does not involve the vibration of the skull bone. Therefore, cartilage conduction is referred to as the “third auditory pathway”.
Doppler Labs was a San Francisco-based audio technology company, founded in 2013. The company designed and manufactured in-ear computing technology, including earplugs and wireless smart earbuds.
A middle ear implant is a hearing device that is surgically implanted into the middle ear. They help people with conductive, sensorineural or mixed hearing loss to hear.
€2.47 billion (fiscal year 2022-23) [2] 