Infrared systems use infrared light to transmit sound. A transmitter converts sound into a light signal and beams it to a receiver that is worn by a listener. The receiver decodes the infrared signal back to sound. As with FM systems, people whose hearing aids or cochlear implants have a telecoil may also wear a neckloop or silhouette inductor to convert the infrared signal into a magnetic signal, which can be picked up through their telecoil. Unlike induction loop or FM systems, the infrared signal cannot pass through walls, making it particularly useful in courtrooms, where confidential information is often discussed, and in buildings where competing signals can be a problem, such as classrooms or movie theaters. However, infrared systems cannot be used in environments with too many competing light sources, such as outdoors or in strongly lit rooms.
Infrared systems are often used in the home with TV sets, but, like FM systems, they can also be used in large settings like theaters.
With an infrared system, sound from the TV is transmitted using infrared light waves. This sound is transmitted to your receiver, which you can adjust to your desired volume. The TV can be set to a volume comfortable for any other viewers with normal hearing. Thus, TV watching as a family becomes pleasurable for all.