T-coils in hearing aids are activated by what?

T-coils, or telecoils, in hearing aids are designed to be activated by electromagnetic fields. These coils pick up magnetic signals produced by telephone receivers and other assistive listening devices, allowing users to hear more clearly in various environments. When a hearing aid user is close to a device that emits these electromagnetic fields, such as a landline phone or a hearing loop system, the T-coil picks up the electromagnetic signal and converts it into sound.

The significance of this activation lies in its ability to enhance listening in areas with background noise or when communication is needed at a distance from the sound source. By using the T-coil setting, users can directly access audio signals, leading to improved clarity and reduced interference from ambient sounds. This feature exemplifies how digital technology merges with traditional assistive devices to accommodate diverse hearing needs.