How a loop system works?
An electromagnetic field is created around a cable when a current flows in the cable, this electromagnetic field is capable to carry audio signal. A hearing aid and cochlear implant with telecoil capability or a special designed loop receiver contain a small coil known as a telecoil, the telecoil picks up the electromagnetic signal and the electronic circuit in your hearing device will extract and amplify the audio signal.
1- Audio source either microphone connection or an existing PA.
2-Loop amplifier drives a current in to the loop
3-induction loop comprises one or more turns of insulated wire laid around the listening area.
4- Required listening area
5 -Built in coil known as "telecoil" or "T switch"
6-Hearing instrument with a telecoil switch