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Hearing Induction Loops

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Induction Loop Information

Audio Induction Loop systems, are an aid for the hard of hearing. They are a loop of cable around a designated area, usually a room or a building, which generates a magnetic field picked up by a hearing aid.

How do induction loops work?

An induction loop system transmits an audio signal directly into a hearing aid via a magnetic field, greatly reducing background noise, competing sounds, reverberation and other acoustic distortions that reduce clarity of sound.

This diagram illustrates how they work.

Audio Inputs 1, either from an existing audio source such as a P.A. system or from dedicated microphone inputs feed an audio signal into an Induction Loop Amplifier 2. The amplifier drives a current into a Loop 3 or series of loops. As the current flows through the cable it creates a Magnetic Field 4 in the required area – careful loop and amplifier design ensures that the vertical component of the field is even and free of dropouts and dead zones wherever the user might be. Inside most Hearing Aids 5, a small coil known as a Telecoil 6 picks up the magnetic field signal, which is amplified into a high quality audio signal delivered directly to the ear of the hearing aid user.

Where can induction loops be used?

Induction Loops can be beneficial in a very wide range of environments, from large venues such as theatres and conference facilities, to one-to-one communications such as ticket counters and meeting rooms. They are the only effective solution to assist hearing aid users in transport environments, in vehicles, terminals and stations.

Examples of existing applications for Ampetronic induction loop systems:

  • Transport Systems
    Airports, stations and transport networks, Elevators, Help points, Car park access points
  • Vehicles
    Taxis and private cars, Minibuses, Coaches, Trains, Trams and Boats
  • Venues
    Theatres, cinemas and concert halls, Stadia and sports venues, Places of Worship, Conference and lecture halls
  • Point-of-Service
    Counters, Intercoms and entry-phones, Drive-throughs, Help points
  • Work
    Meeting rooms, Video conference facilities, Desks and offices
  • Home
    TV rooms, Phones, Individual car systems
  • Education
    Lecture halls, Classrooms
  • Safety
    Public address systems, Voice alarm systems, Help points

Induction loop systems are not suitable if:

  • There is substantial background noise, which will reduce the effectiveness of any assistive listening system
  • There is no practical way to install the loop cable (sometimes requires creative solutions – ask if you are not sure!)
  • There is no sufficiently good quality audio source available
Hearing Induction Loops