1.3 System technology
1.3.1 Basic system concept
The system composition of TES-5600 digital infrared
wireless classroom audio system is shown in figure 1.2.
It is composed of:
Digital infrared wireless microphones
Digital infrared wireless main unit for system control
Digital infrared receiver(s) for connection to main
unit
The digital infrared receiver(s) receive infrared signals
from every digital infrared wireless microphone and
convert the signals into audio or control signals which
are transmitted to the main unit.
Figure 1.2 The basic system concept
1.3.2 IR radiation
Audio and control signals of TES-5600 are transmitted
as modulated infrared light. Infrared radiation is part of
the electro-magnetic spectrum, which is composed of
visible light, radio waves and other types of radiation.
Its wavelength is longer in comparison with the
wavelength of visible light.
Infrared light cannot pass through opaque walls and
ceilings thus guarantees privacy of the meeting by
avoiding being intercepted or disturbed. In addition,
infrared light has no radio radiation and a license is not
required when operating infrared light systems.
1.3.3 Carriers and channels
TAIDEN TES-5600 digital infrared wireless conference
system adopts 1-8 MHz wave band. This wave band is
suitable for the transmission of wide band audio and
corresponding signals. TES-5600 uses 4 frequency
points of BAND
Ⅲ
and BAND
Ⅳ
in IEC 61603(please
refer to table 1.1.)
Route
Channel
Frequency
From
microphone to
main unit via
receiver
channel 1
1.0 MHz
channel 2
1.6 MHz
channel 3
2.3 MHz
channel 4
3.0 MHz
Table 1.1 Channels and corresponding frequencies in
TES-5600 system
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