Assistive Listening Devices

They are amplifiers that bring sound directly into the ear. They separate the sounds, particularly speech, that a person wants to hear from background noise. They improve what is known as the “speech to noise ratio.”Research indicates that people who are hard of hearing require a volume (signal to noise ratio) increase of about 15 to 25 dB in order to achieve the same level of understanding as people with normal hearing. An ALD allows them to achieve this gain for themselves without making it too loud for everyone else.ALDs are used by people with all degrees of hearing loss, from mild to profound.

This includes hearing aid users and cochlear implant users, as well as consumers who do not use either hearing aids or cochlear implants. Hearing aids or cochlear implants have performance limitations and do not work well in all situations. ALDs are sometimes described as “binoculars for the ears” because they “stretch” hearing aids and cochlear implants, thus extending their reach and increasing their effectiveness.

Types of ALDs:


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