1.4 Aspects of infrared signal transmission
To benefit from the advantages of a digital infrared
wireless conference system the signals should be
transmitted undisturbed. This is achieved by using
digital infrared transceivers well positioned and
sufficient in quantity to ensure uniform and adequate
infrared radiation for all conference units.
When planning a digital infrared wireless conference
system, several aspects influencing the uniformity and
quality of the infrared signal should be considered.
These are discussed in the next sections.
1.4.1 Ambient lighting
HCS-5300/80 system adopts 1~8 MHz wave band, and
has very good anti-interference performance (see
figure 1.4, figure 1.5).
Figure 1.4 High frequency lights disturbance from HF
driven light sources (energy-saving lamps)
Figure 1.5 New generation digital infrared conference
system with 1-8 MHz wave band can avoid high frequency
lights disturbance
For meeting rooms with large, unscreened windows,
multi-transceiver operation should be considered. For
outdoor using, a site test will be required to determine
the needed amount of transceivers. With sufficient
transceivers, perfect signal transmission can be fulfilled
even in bright sunlight.
1.4.2 Objects, surfaces and reflections
Just like visible light, infrared radiation is reflected from
hard surfaces and refracted by hyaloid (glassy or
transparent appearance) items. Objects in the
conference venue as well as structure of the walls and
ceilings will influence the distribution of infrared light.
Infrared radiation is reflected from almost all hard
surfaces. Smooth, bright or shiny surfaces reflect well.
Dark or rough surfaces absorb a large part of the
infrared energy. Usually, surfaces opaque to visible
light are also opaque to infrared radiation.
Shadows from walls and furniture will influence the
transmission of infrared light. This can be solved by
using a sufficient quantity of transceivers. They should
be positioned in a manner to provide an infrared field
strong enough to cover the whole conference area.
Make sure that each infrared wireless conference unit
can communicate simultaneously with at least two
transceivers to guarantee stable adequate infrared
signal transmission.
6
Summary of Contents for HCS-5300MA/80
Page 9: ...8 14 Display language list 103 Appendix 104 Dedicated 6 PIN Extension Cable 104 VIII...
Page 32: ...Figure 2 11 System connection Wireless discussion video tracking central control 20...
Page 46: ...Figure 2 17 Audio mode setting External Process Mode2 34...
Page 69: ...Figure 3 28 Requirements of user customized suspension 57...
Page 116: ...Appendix Dedicated 6 PIN Extension Cable 104...
