Induction Loop Systems

Sound Induction Systems installed their first induction loop system in 1985 and have now provided over a thousand systems throughout the U.K and abroad. Since then, the requirements for induction loops have been included in both Section M of the Building Regulations and the Equality Act. We are organisational members of the Action on Hearing Loss (RNID) and are listed installers with Wales Council for Deaf People, DISSBase and many other organisations.

Induction loop system sign

Audio Frequency Induction Loop Systems (A.F.I.L.S) are used by hearing aid wearers to assist them to hear clearly in difficult acoustic environments e.g. churches, theatres, reception areas, etc.

Induction loops replace the sound path between the signal sound and the hearing aid wearer with a magnetic field. The magnetic field is induced into the “telecoil” (hence the “T” position) which is featured on most hearing aids, and converted back to audio. When a hearing aid is switched to the “T” position the microphone on the hearing aid is disconnected, so the user simply hears what is fed into the induction loop system, without the background noise.

In the UK, the installation of induction loop systems is governed by BS7594 (The Code of Practice for Audio-Frequency Induction Loop Systems) and EN60118-4 (Magnetic field strength in audio frequency induction loop systems for hearing aid purposes).

Audio frequency induction loop systemA induction loop system comprises an input source e.g. microphone, output from sound system etc, a dedicated loop driver amplifier and an antenna. Systems are available in 3 main types. 1 Perimeter (shown above), 2 Low spillover and 3 Localised field systems.

1  Perimeter induction loop systems are the most common and are used in applications where a room is to be covered by the loop system. This system has the loop cable run around the perimeter of the room forming a complete “loop”, so the whole room is covered by the magnetic field. This would normally be used in churches, village halls, etc. It must be noted that the magnetic field produced by a perimeter loop can radiate for many metres outside the looped area. This is called overspill. Therefore if confidentiality is an issue or adjacent rooms need systems a low spillover loop should be installed.

2  Low spillover induction loops are used where confidentiality dictates that the magnetic field from the loop must not spill outside the installed room or interfere with adjacent loops. These systems are generally more expensive and are not always possible to install. An often cheaper alternative is an infrared loop system.

3  Localised field induction loop systems are used in reception desks, ticket counters, etc. The loop amplifier is fed into a loop coil (usually fitted into the desk) and covers an area of about 1 metre. These systems are available in installed and portable formats.

Counter induction loop hearing system

Example of a localised field induction loop system in a cashiers desk

The hearing aid wearer approaches the glazed window and tries to communicate with the assistant. As well as picking up the assistant’s voice, the hearing aid’s microphone amplifies all the sounds in the area - the road noise every time the door opens, other customers talking, background music, etc. With this mixture of sounds it can be incredibly frustrating for hearing aid wearers and sometime impossible to hear.

The hearing aid wearer simply switches their hearing aid to the “T” position and the background noise is significantly reduced. Now they are able to hear the assistant’s voice clearly. The signal radiates for approximately 1m from the installed position reducing the risk of other customers hearing the conversation and interference from the positions either side.

We also install Speech transfer sound systems with induction loops which includes a loudspeaker and microphone each side of the glass for low level amplification, allowing everybody to hear more clearly.

Sound Induction Systems can design, supply, install and service any induction loop system. We have installed systems in schools, colleges, universities, village halls, community centres, doctors surgeries, hospitals, churches, chapels, cathedrals, ticket counters, reception desks, theatres, museums, libraries, meeting rooms, boardrooms, council chambers and many other premises.

We supply induction loop amplifiers and equipment from all the major manufacturers so can select the best equipment to suit each customer’s individual needs, including a DIY domestic system. When an induction loop system is purchased by a hearing-impaired individual, a charity or a church the VAT may be Zero Rated. For more information please contact us.

Portable Induction Loop systems

Speech Transfer system with induction loop

Have you considered an Infrared hearing system?

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