Assistive Listening - Other
The purpose of an assistive listening system is to send audio directly to the listeners, either through a headphone/earpiece, or perhaps directly to their hearing aid, so that reverberations and background noise do not make the sound unintelligible. There are 4 main types of assistive listening systems:
Here are the pros and cons of each:
Conventional FM: Pros - FM systems are easy to install and use, relatively inexpensive, and flexible in that they work for people with or without hearing aids.
Cons - If you have multiple adjacent rooms - such as a multiplex movie theater, or a court building - each room may need to be on a different channel. They cannot provide 'absolute guaranteed secrecy' which may be needed in a courtroom, or other government or high-security locations.
Digital FM: Pros - These newer systems - Digi-Wave being the best known brand - offer 2 way communication. So they are great for classrooms.
Cons - digital systems have a fairly short range, and are more expensive than simpler FM systems.
Infrared: Pros - IR systems can have total security, which makes them great for courtrooms and top-secret events. They can also be used in multiplex movie theaters, where all the theaters can be on the same channel, with no signals straying from one theater to another.
Cons - generally more expensive than conventional FM systems. They have a much smaller range than FM systems, and may require skilled installation. Some IR systems are not very portable.
Inductive Loop: Pros - With an inductive loop system, listeners who have a T-coil switch on their hearing aids can pick up the audio without any additional device.
Cons - Inductive loop systems are best installed when the building is under construction. Retrofitting is harder. Installation requires s specialist technician.