PDA Range PDA200/2 - What Is an Audio Frequency Induction Loop System

PDA Pro-Range Instructions • Approved Doc. No. DCP0003168 Rev 1 • Page 3
An audio-frequency induction loop system (AFILS) allows hearing impaired
people to hear more clearly.
Most hearing aids have a ‘T’ or ‘MT’ switch which allows them to pick up the
electromagnetic field generated by an induction loop system. The hearing aid
converts this signal into a sound suited to its user’s specific hearing requirements.
Any hearing impaired person positioned within or near the loop can hear the loop signal by
switching their hearing aid to the correct position, allowing them to participate more effectively
in general conversation, ordering goods or services, listening to public performances, etc.
An induction loop system therefore comprises four main elements:-
The audio source – typically a microphone, television or radio (or a combination of these).
The induction loop amplifier
The loop – typically a single turn of wire usually run around the perimeter of the room.
The receiver(s) – any hearing aid with a ‘T’ or ‘MT’ switch.
What is an audio frequency induction loop system?
In addition to having a mic. and a mic./line input (which allows the
above system configuration to be easily implemented), all PDA
Pro-Range amplifiers also have an ‘Outreach’ socket. This socket
offers full compatibility with our unique Outreach plate audio input
extension system and allows the connection of multiple microphone
O
U
T
R
E
A
C
H
C
O
M
P
A
T
I
B
L
E
and/or line level inputs via a range of specially designed single gang connector plates.
For further details please refer to page 7.
M
T
Television
Amplifier
Loop
Microphone
Hearing aid in the
‘T’ or ‘MT’ position
Signal cable
Signal cable