Assistive listening devices (ALDs) are small amplifiers that bring sound directly to the ear of the user. They separate the sounds, particularly speech, that a person wants to hear from background noise—improving the “speech to noise ratio”. They can be used with or without hearing aids or a cochlear implant. These devices help improve hearing during phone conversations, in theatres or a lecture hall, during tv shows or movies, in places of worship, and have many other everyday uses. A single transmitter can send the same sound to many receivers, making it good for group settings.
What kinds of assistive listening systems are there?
FM System
An FM System is a wireless assistive hearing device that transmits sounds directly from the source. This type of ALD can be used on its own or to improve the use of hearing aids or a cochlear implant. It is available from companies like Williams Sound.
Hearing Induction Loop
A hearing loop, or induction loop, uses telecoils to magnetically transmit sound directly to hearing aids and cochlear implants through a magnetic field. They work to reduce background noise and other competing sounds in loud environments. These systems use a wire or flat copper tape installed on the floor of a venue. Learn more at HearingLoop.Org
Infrared System
An infrared hearing system is a popular alternative to an induction loop system. A typical system consists of an audio source, an infrared radiator (transmitter), and infrared listening receivers. Learn more at HearingLink.org
WiFi-Based Systems
WiFi assisted listening allows you to use your phone or other WiFi-enabled devices to connect to a network and listen to an audio broadcast. This is great for people with Bluetooth earbuds, or those who prefer not to use a pack. Companies like Listen Tech help design these assistive listening solutions.
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