Design

The design of induction loops, also known as hearing loops or audio-frequency induction loops (AFILs), is a critical aspect of creating inclusive environments, particularly in public spaces such as theaters, conference rooms, and transportation hubs. The primary purpose of induction loops is to assist individuals with hearing aids equipped with a T-coil (telecoil) by transmitting sound directly to their hearing devices, thereby improving the clarity of audio signals and reducing background noise.

In designing an induction loop system, several key components and considerations come into play. Firstly, the loop cable, typically made of copper wire, must be installed strategically around the perimeter of the service area to create a magnetic field. The size and shape of the loop are determined by the room’s dimensions and the coverage required, ensuring that the entire target area receives consistent signal strength.

Supply & Installation

The audio source, be it a microphone, TV system, or public address (PA) system, connects to an induction loop amplifier. This amplifier converts the audio signal into a current that flows through the loop cable, thereby generating a magnetic field.

It is crucial to select an amplifier with the appropriate power output to adequately cover the desired area without distortion or signal loss.

Moreover, the installation must consider potential interference from metallic structures within the building, as they can disrupt the magnetic field. To mitigate this, thorough testing and site surveys are conducted to identify and address any issues prior to final installation. The system should also comply with relevant standards and regulations, such as IEC 60118-4, to ensure effective performance and accessibility.