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Loopset LPS-3
Loopset LPS-3
Introduction
Hearing impaired people, who use hearing aids (HA), have problems in
using cellular phones. They can't identify speech, partly due to poor
S/N–ratio and partly because of interference. Most HA have poor protec-
tion for interferences. By using the Loopset the interference problems are
minimized.
LPS–3 is designed for DCT3.5, DCT3.75 and DCT 4 series phones.
4–wire interface is implemented with 2.5mm diameter round plug/jack
which is otherwise like "standard" stereo plug.
The Loopset has been developed for hearing aid users to allow them to
use mobile phones. It is based on induction technology. These kind of
induction devices are widely used with hearing aids, but never before im-
plemented with cellular phones.
All hearing aids have support for induction loop, ie. they have a little tele-
coil inside. This coil can capture the signal supplied to the loop.
Standard hearing aids have two operation modes; M–mode for normal
microphone use and T–mode for telecoil use
The T–mode is used in places where the inductive loop has been as-
sembled, for example in public halls, churches and places of assembly.
The reason for T–mode use is much better S/N–ratio.
The Loopset provides clear acoustic quality. The Loopset also dampens
backgroud noise to make it easier to converse in a noisy environment, in
the car for instance.
The Loopset can be used with all the mobile phones, which supports nor-
mal headset and vibra alarm. Vibra is needed just for call indication. The
earpiece of a headset is replaced by a wireloop. Loopset has also inte-
grated microphone.
The earpiece of a headset is replaced by a wireloop. Loopset has also
integrated microphone.
The function is very simple and the use is environmentally friendly. Loop-
set is passed around the neck. The system doesn't disturb anybody due
to the silent service. When the phone is set to auto–answer mode, a user
don't have to do anything but switch the hearing aid to T–mode.
Loopset is an economic and simple solution for hearing aid users. Most
hearing aids are compatible to this kind of wireless handsfree.
Page 4
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Issue 1 12/99
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