Hearing loops, also known as induction loops, are assistive listening systems that use electromagnetic fields to transmit sound directly to hearing aids and cochlear implants equipped with telecoils (T-coils).
Infrared (IR) systems are assistive listening technologies that use invisible light waves to transmit sound from a source to a receiver worn by the listener. These systems require a direct line of sight between the transmitter and receiver and are commonly used in places where privacy and signal containment are important.
FM (radio frequency) systems are assistive listening technologies that use radio waves to transmit sound from a source to a receiver worn by the listener. These systems are less affected by physical obstructions and are well suited to settings where users may move around and can be used outdoors.
Audio over Wi-Fi systems are assistive listening technologies that transmit sound via a wireless internet connection to a listener’s personal device, such as a smartphone or tablet. These systems offer flexibility and discretion, making them ideal for venues where users prefer to use their own equipment and where Wi-Fi infrastructure is already in place.
Auracast is a next-generation assistive listening technology that uses Bluetooth to broadcast audio from one source to many receivers, without the need for individual pairing. Compatible with hearing aids, cochlear implants, earbuds, and headphones, it enables users to connect directly to public or private audio streams.
Because assistive listening technologies transmit audio signals that are invisible and inaudible without the proper receiver, signage is the key visual indicator that accessible audio services are available. Without clear signs, many people with hearing loss may remain unaware of the support available, missing out on improved hearing experiences.
Clear signage is often a legal requirement under accessibility laws worldwide, including the Americans with Disabilities Act (ADA) in the United States, the Equality Act in the UK, and similar legislation in Europe and Australia. These laws mandate that facilities inform visitors of the availability of assistive listening devices through properly displayed symbols.
When enabled, the telecoil bypasses the device’s microphone and directly converts the magnetic field generated by the loop into audio signals. This allows for clearer, more focused sound by minimizing ambient noise and enhancing speech transmitted through microphones or public address systems.
IAHA membership is open to organisations involved in creating and installing assistive listening systems, as well as those supporting the interests of people with hearing loss. It doesn’t just include manufacturers of assistive technologies, but also influential groups and individuals working to improve hearing access across society.