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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 listening height(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-K1 | Installation and user manual |
6. Safety notes
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 of theamplifier.
To position the loop in the space to be
equipped, it is important to take into account the
final users of the system.
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.
