8
Hearing aid operating diagram with the T-position - Figure 3
LD Series | Installation and user manual
User manual
3. Technology presentation
3.2 Working principle
Pictogram used to indicate a loop
system - Figure 2
Referto figure 2
An induction loop system is intented to help hard of
hearing people to receive a clear audio signal into
their hearing aid without being disturb by
background noises . Thanks to this system, the
sound coming from an audio source (speaker
microphone, sound system, television) is transmitted
by induction to hearing aid user who can thus enjoy
clear sound without being disturbed by any ambient
noise. This system is mainly used in public places
(conference rooms, cinemas, courts, churches, ticket
offices, etc.) but can also be installed at home. Many
conventional hearing aids have a "T" loop function.
3.1 What is an AFILS (Audio Frequency
Induction Loop System)?
A magnetic loop system consists of an electric wire
Layed down around a room forming a loop. The
cable is connected to a loop amplifier, connected
itself to an audio source. The loop amplifier convert
the audio signal into electric pulses transmitted
through the cable, creating a magnetic field. Heairing
aids equipped with a coil (often called a "T" or "T-
coil". ) will capture this signal and transmit it to
hearing impared.
By induction, the electrical signal present in the loop
ill be reflected in the coil of the hearing aid. The coil
transmits the signal of the loop in the internal
amplifier of the prosthesis, which then bring it to the
ear of the hearing impaired person, free of
background noise and environmental disturbances.
The audio source can come from various origins. In a
cinema, for example, the sound of the film will be
transmitted. In a conference room, the sound of the
speaker's microphone will be transmitted. In a
subway station, the voice of the agent will be
transmitted...
The loop can be installed on the floor or ceiling. The
loop is integrated into the building, just like the
electrical installation.
The presence of a hearing loop is often indicated by
a blue logo representing a barred ear and the letter
"T".
Summary of Contents for LD 1.0
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