For most people, a modern hearing aid is enough to compensate for any hearing issues that are present. But for some people — or in some situations — additional assistive listening devices (ALDs) might be needed.
Here are some of the most common types of ALDs that may help you with hearing difficulties that your hearing aid can’t deal with on its own.
A personal amplifier is just what it sounds like. A small, easily transportable amplifier with a microphone and that boosts volume. They aren’t really for crowded situations, but rather work well for one-on-one conversations. Usually, the other person in the conversation clips the mic to themselves — like newscasters — and is able to speak in their normal voice, while the amplifier makes them easier to hear.
A more flexible device better suited for more complex situations is an FM system. It’s simply a transmitter system that uses the FM radio spectrum to bring sounds to the listener. As with an amplifier system, the speaker is “mic’d up” and what they’re saying — or playing on an instrument — is broadcast in a very localized area.
An infrared ALD works in much the same way, only instead of wavelengths in the radio spectrum transmitting sound the light wave spectrum is utilized. These systems tend to be used in very specific situations. Their weakness is that sunlight can interfere with them and infrared systems can’t pass through solid objects like walls. But that is also one of their strengths, since they provide a level of privacy that FM transmitters cannot.
Finally, induction loop systems use electromagnetic fields to get amplified sound to the end user. They are very versatile systems that are becoming more common in public spaces, such as schools, concert halls, and stadiums. Basically, a loop of wire is placed in an area and powered up, creating a magnetic field that any receiver — including many hearing aids — can pick up a signal from. They are slowly becoming common, much like wheelchair access ramps did years ago.