•
Do not connect more than 4 Digital Boundary
Microphones. Doing so will cause all Digital
Boundary Microphones to stop working. If an
Analogue Boundary Microphone is also
connected, all audio input from the Analogue
Boundary Microphone will also stop working.
•
If both of the following conditions are met, the
output sent to the other party will be stereo;
otherwise, monaural:
–
The bandwidth is higher than approximately
1.8 Mbps in a 2-party video conference call
with the HD Visual Communication Unit.
–
The MIC position is set automatically or
manually to collect a sound in stereo.
•
If a headset is connected, audio from the
headset microphone is given priority, and audio
from Digital Boundary Microphones is no longer
picked up.
The range of each microphone (the radius of the circle
with a microphone at the centre) varies according to the
level of surrounding and the number of microphones
being used. Place microphones accordingly, referring
to the following table.
Noise
level/
Micro–
phone
A quiet
room (40
dBsplA)
A regular
room (45
dBsplA)
A noisy
room (50
dBsplA)
1
approx.
3 m
(approx.
9.8 ft)
approx.
2.2 m
(approx.
7.2 ft)
approx.
1.2 m
(approx.
3.9 ft)
2
approx.
2.8 m
(approx.
9.2 ft)
approx.
1.5 m
(approx.
4.9 ft)
approx.
1 m
(approx.
3.3 ft)
3
approx.
2.3 m
(approx.
7.5 ft)
approx.
1.3 m
(approx.
4.3 ft)
—
4
approx.
2 m
(approx.
6.5 ft)
approx.
1.1 m
(approx.
3.6 ft)
—
Layout examples (a regular room)
(the grey circle indicates the microphone’s range):
Display
Microphone
4 m
(13.1 ft)
4 m
(13.1 ft)
Microphone
Display
4 m
(13.1 ft)
Microphone
Microphone
Microphone
Microphone
4 m
(13.1 ft)
4 m
(13.1 ft)
4 m
(13.1 ft)
Display
Document Version 2015-08
User Manual
29
Preparation
