FM Systems
FM systems are radio based systems. In the context of assistive listening, they can be used in several ways.
As an alternative to an induction loop system.
In this application, the venue will install an FM radio transmitter and connect it to the audio feed(s), microphones, video, TV and or other audio sources as required. Visitors wishing to use the service will be loaned a receiver with head phones, a neck loop or a loop hook, by the venue.
Head phones can be used by anyone needing hearing assistance whether they have a hearing aid or not. However, hearing aid users may find them uncomfortable and they may introduce feedback in the hearing aid.
Neck Loops are essentially a personal induction loop. Instead of the loop being installed around the room, it is worn around the neck. To use the neck loop, it must be plugged into the FM receiver and worn around the neck like a lanyard. The hearing aid must be switched to the T' position.
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As an enhancement to an induction loop system
Assistive listening systems rely on positioning the microphone as close to the person speaking as possible. For many situations fixed microphones are acceptable, but if the presenter naturally moves around whilst presenting, possibly even turning their back to write on a board, (not all presenters are deaf aware) or perhaps there is a need for audience participation, then radio microphones provide the best solution.
In this case, the radio microphones will transmit on different channels (unless they are push to talk) to a fixed receiver which is connected to an input of the induction loop amplifier.
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As a personal communication system
Personal FM communication systems are similar. The user hands the radio microphone to the speaker and connects the corresponding portable fm receiver to the hearing aid. This connection can be through a direct wired connection to the hearing aid, by driving a net loop and using the T- position or in some cases, a proprietary fm receiver boot is clipped to the hearing aid.
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