How does an Audio Frequency Induction Loop work?
In the most basic form, an audio induction loop system consists of a loop of wire around the perimeter of an area that is connected to an induction loop amplifier. An input signal is provided to the induction loop amplifier, and the induction loop amplifier drives an audio current (note current not voltage) through the loop in the form of a strong alternating current. As the alternating current from the amplifier flows through the loop, it creates a magnetic field within the looped area and “induces” the telecoil in a hearing aid , or specifically design induction loop receiver , within the looped area. When a hearing aid user switches their hearing aid to the “T” position on the hearing aid, the telecoil in the hearing aid picks up the fluctuations in the magnetic field and converts them back into alternating currents. The alternating currents are amplified and converted by the hearing aid into sound. The input to the induction loop amplifier can be a sound source such as a television
