Although it is widely known and widely used in the world of accessibility, the general public is still unaware of what a magnetic induction loop is and what it is used for. This system allows sound to be transmitted clearly to people who use hearing aids or cochlear implants, and is commonly used in public places such as theatres, auditoriums, transport stations and banks. Signposted in these spaces with an image of an ear, many people will have seen it, but will not have been able to identify it. Here we explain what it is and how it works.
What is a magnetic induction loop?
A magnetic induction loop is a system that uses magnetic fields to transmit audio signals directly to hearing devices, such as hearing aids or cochlear implants. It works by placing a wire, forming a loop, around a certain area.
This wire carries an electric current that generates a magnetic field in that area. Hearing aids with the ‘T’ option can pick up this signal and convert it into sound, allowing the person to hear without interference or background noise.
The operation of a magnetic induction loop is based on the principle of ‘inductance’, which is the ability of an electrical conductor (such as the loop wire) to induce a magnetic field when an electric current passes through it.
What is it used for?
This system is especially useful for people with hearing loss, as it eliminates background noise and allows better understanding of sound in noisy environments. Some of its main uses include:
- Public spaces: such as auditoriums, theatres, and conference rooms, where people need to clearly capture speeches and presentations.
- Means of transport: train stations and airports, where public address announcements can be difficult to understand due to ambient noise.
- Commercial establishments and banks: at customer service counters, where this system helps the customer to receive information in a clear manner.
- Accessible service points: in any public service area, to facilitate communication and information.
AIS and the magnetic induction loop
The AIS accessibility certificate, specifically the AIS 1/2023 Standard, verifies the installation and use of magnetic induction loops in the functional area of Information and Communication, recommending their use in accessible service points, information points, auditoriums…
