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CHAPTER 6: Environmental Aids and Strategies
for: the door, TV and radio, loop systems, telephone, the baby and alarm clocks. 

Plus: Hearing Dogs for Deaf People

 

This page covers:

Section C - Loop systems
What is a loop system?

C.a. For loop systems in the home: see TV and radio section and the doorbell
C.b. Loop systems in other public places and other people's homes etc
C.c. Loop systems in the car

Click on the links in the left hand column to see the other sections

What is a loop system?

 

An induction loop system consists of four main elements:

  • Microphone
  • Amplifier
  • The loop (a wire installed around the room)
  • The receiver (usually an individual's hearing aid set to the 'T' position)

Loop system diagram

 

How do loop systems work?

An induction loop is a wire that goes around the listening area. A current from a loop amplifier powers the wire. The amplifier gets its signal from a microphone placed in front of the person speaking or speaker on the television. The resulting electric current in the loop produces a magnetic field. A deaf person can then pick up this magnetic field if they are sitting within the area of the loop and their hearing aid is switched to the ‘T’ setting.

The loop wire can go round the whole room or part of the room (as shown in the diagram above), the wire running around the skirting board or under carpets/rugs (this is a room loop),

or the loop wire can be around where the deaf person is sitting, (e.g. a loop pad on their chair),

or the loop wire can be around the person’s neck (a neck loop).

A neck loop works with a personal listener, which may have a built-in microphone and/or an external microphone which can given to a speaker or attached to the TV/radio speaker. (Click here for more information on personal listeners.)

There are also loophooks which are the same as neckloops except that the loop is hooked over the ear and worn right next to the hearing aid.

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C.a For loop systems in the home:

see the TV and radio section which includes information about personal listeners and loops.

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C.b. Loop systems in other public places and other people's homes, etc

http://tbn0.google.com/images?q=tbn:bRmLrP2DQjlYDM:http://www.stoke.gov.uk/ccm/cms-service/stream/image/%3Fimage_id%3D1398295  If a public place displays the ear symbol with a T in the corner it shows there should be a loop system available for people with compatible hearing aids.

 

1. I ask for the loop to be switched on.

2. I ask where the best place is to sit (i.e. I find out which is the area "covered" by the loop).

3. If I go to a gathering where there is a loop system I test it before the session starts because it means that I can then go into the meeting feeling relaxed.  (Editor’s note: It helps to remember that even a loop that has been tested can go wrong a short while later.)

http://tbn0.google.com/images?q=tbn:E0Z1nB5KSSEwsM:http://www.alertelectrical.com/files/portable%2520system.jpg
http://tbn0.google.com/images?q=tbn:sSSWUk99wp-rlM:http://www.tomacltd.co.uk/custom/induction%2520loop.jpg
Some public places have a portable loop which may look similar to the ones on the left. 

Some people who have tried using portable loops have found them useful, others have found them to be not much use as they were not powerful enough for them, even when turned up to maximum volume

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C.c Loop systems in the car

It is also possible to obtain loops systems for some cars.  This can help with either listening to passengers or listening to the car audio equipment (radio or CD, etc.)  Some cars are not suitable as they can cause interference with the loop system. A loop system for the car is available from Gordon Morris and Action on Hearing Loss Solutions.

Some personal listeners can also be used to pick up the loop signal in the car, but performance can vary from car to car.  You also need to consider safety if using a personal listener in the car and make sure that in the event of an emergency stop, the listener will not fly about and cause injury.  You could perhaps attach it to the dashboard with strong Velcro, or put it in your pocket.

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