Other decrements in auditory perception caused by sensorineural hearing loss, such as abnormal spectral and temporal processing, and which may negatively affect speech perception, are more difficult to compensate for using digital signal processing and in some cases may be exacerbated by the use of amplification. Sensorineural hearing loss reduces the sensitivity to sound, which a hearing aid can partially accommodate by making sound louder. The most common form of hearing loss for which hearing aids are sought is sensorineural, resulting from damage to the hair cells and synapses of the cochlea and auditory nerve. Hearing aids are incapable of truly correcting a hearing loss they are an aid to make sounds more audible. The amount of benefit experienced by the user of the hearing aid is multi-factorial, depending on the type, severity, and etiology of the hearing loss, the technology and fitting of the device, and on the motivation, personality, lifestyle, and overall health of the user. Hearing aid candidacy is typically determined by a Doctor of Audiology, who will also fit the device based on the nature and degree of the hearing loss being treated. Hearing aids are used for a variety of pathologies including sensorineural hearing loss, conductive hearing loss, and single-sided deafness. 6 Evolution of hearing aid applications.5 Difference between PSAP and digital hearing aids.4.7.4 Difference between digital hearing aid and hearing aid application.4.7.3 Difference between digital and analog hearing aids.Devices similar to hearing aids include the osseointegrated auditory prosthesis (formerly called the bone-anchored hearing aid) and cochlear implant. Almost all hearing aids in use in the US are digital hearing aids. The amount of benefit a hearing aid delivers depends in large part on the quality of its fitting. This process is called 'fitting' and is performed by a Doctor of Audiology, also called an audiologist (AuD), or by a Hearing Instrument Specialist (HIS). The hearing aid is fitted to the most recent audiogram and is programmed by frequency. Modern hearing aids require configuration to match the hearing loss, physical features, and lifestyle of the wearer. Such signal processing includes feedback management, wide dynamic range compression, directionality, frequency lowering, and noise reduction. Modern devices also utilize sophisticated digital signal processing to try and improve speech intelligibility and comfort for the user. Modern devices are computerised electroacoustic systems that transform environmental sound to make it audible, according to audiometrical and cognitive rules. Small audio amplifiers such as PSAPs or other plain sound reinforcing systems cannot be sold as 'hearing aids'.Д®arly devices, such as ear trumpets or ear horns, were passive amplification cones designed to gather sound energy and direct it into the ear canal. Hearing aids are classified as medical devices in most countries, and regulated by the respective regulations. A hearing aid is a device designed to improve hearing by making sound audible to a person with hearing loss.

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