10
5. Explication
The wire forming the loop are connected to an
audio amplifier. The hearing aid often called "T" or
"T-coil" which is placed inside spirale wire. The
magnetic field generated by the large loop will
cross the coil and, by the induction process, the
electrical signal present in the large loop will be
found in the one small. The signal of the au- dio
amplifier is transmitted to the hearing aids, which
will then restore it to the ear of the im- paired
ones.
The loop can be installed in the floor or at the
roof level, more precisely between 1.10m and
2.20m from the listeningheight(ears).
The presence of an hearing loop is often indi-
cated by a blue logo representing a crossed out
ear and a letter T. Generally, a hearing aid has two
major positions, the M and the T.The posi- tion M
makes it possible to perceive the sound thanks to
sound pressure as a microphone, while the
position T (T for telephone) directly receives the
audio signals transmitted by induc- tion via the
integrated coil. Some aids combine these two
modes of operation with the MT posi- tion. It
allows the hearing impaired to perceive both
ambient noise and inductively transmitted signals.
DCL20-K2 | Installation and user manual |
6. Safetynotes
The majority of problems with the hearing loop
loop happens when the installation has not been
properly reflected so let's take a while be- fore
starting the installation to better results and time
saving.
Ideally, the loop amplifier should be placed near
the area to be covered. This may involve placing
the amplifier on a panel, under a desk or under a
table.
The pickup microphone should be as close as
possible to the input oftheamplifier.
To position the loop in the space to be equipped,
it is important to take into account the final users
of thesystem.
For example, if the place is planned for a con-
versation between a speaker and a client, a loop
around the desk may be a better solution rather
than a loop around the perimeter of the room. It
will limit radiation and increase confidentiali- ty.
