INDUCTION LOOPS
Many hearing aids have a 'T' switch which allows them to pick up magnetic waves from a telephone rather than the usual sound waves. This cuts out background sound while on the telephone.
This induction technology can be used on a larger scale by providing a small loop at a counter or a larger loop round a meeting room or a large hall. In a hall, the best effect might be obtained near the edge of the room where the loop is located.
The loop consists of a microphone and a small amplifier unit, which sends signals into the induction loop. These helps cut out background sound and reduces the need to use a loud voice (which probably doesn't help any way). In this way communication is more positive, confidentiality can be kept and events enjoyed. Pat M of the Building Regulations requires induction loops in appropriate places such as reception areas, meeting rooms and halls.