Overlapping Footprints And Multipath Effects - Shure DT 6008 User Manual

DIS Digital Conference System
Figure 0-J Combination of several reflected signals
For concentrically arranged conference rooms,
centrally placed, angled radiators located high up
can cover the area very efficiently. In rooms with
few or no reflecting surfaces, such as a darkened
film-projection room, the audience should be
covered by direct path infra-red radiation from
radiators positioned in front.
When the direction of the receiver changes, e.g.
with varying seat
radiators in the corners of the room (see Figure
0-K). If the audience is always directed towards the
radiators, you do not need radiators at the back
(see Figure 0-L).
If the path of the infra-red signals is partially
blocked, e.g. under balconies, you should cover the
'shaded' area with an additional radiator (see Figure
0-M). The figures below illustrate the positioning of
the radiators:
Figure 0-K Radiator position for covering seats in a square
arrangement
arrangements, mount
Figure 0-L
the
Figure 0-M
Overlapping footprints and multipath
effects
When the footprints of two radiators partly
overlap, the total coverage area can be larger
than the sum of the two separate footprints. In
the overlap area the signal radiation power of
two radiators are added, which increases the
area where the radiation intensity is larger than
the required intensity.
However, differences in the delays of the signals
picked up by the receiver from two or more
radiators
can result in that the signals cancel each other
out (multi path effect). In worst-case situations
this can lead to a loss of reception at such
positions (black spots).
10
Radiator positioning in a conference hall with
auditorium seating and podium
Radiator for covering seats beneath a balcony
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