Explication - Opus Technologies DCL20-TV Manuel D'installation Et D'utilisation

DCL20-TV | Manuel d'installation et d'utilisation | Installation and user manual |
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5. Explication

The wire forming the loop is connected to an
audio amplifier. The hearing aid has often called
"T" or "T-coil" which is placed inside spiral 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 small one. The signal of the au-
dio amplifier is transmitted to the hearing aids,
which will then restore it to the ear of impaired
ones.
The loop can be installed in the floor or in 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.