58
TANDBERG Videoconferencing System
Advanced use
Echo Control
Each of the 2 microphone inputs have a separate echo canceller. One echo canceller per input provides more
sophisticated control than having one common canceller for all microphones.
Echo control is normally set to ‘
On
’ to prevent the far end from hearing their own audio. Once selected, echo
cancellation is active at all times. The echo canceller continously adjusts itself to the audio characteristics of the
room and compensates for any changes it detects in the audio environment. If the changes in the audio
conditions are very significant the echo canceller may take a second or two to re-adjust.
You can choose to switch off the echo canceller for the available audio sources.
Noise Reduction
In addition to echo cancellation, the system has built-in noise reduction (NR).
NR reduces constant background noise (e.g. noise from air-conditioning systems, cooling fans etc.). In addition, a
highpass filter (Humfilter) reduces very low frequency noise.
Choose
On+NR
to activate both Echo Control and Noise Reduction.
E
CHO
C
ONTROL
SHOULD
BE
SWITCHED
‘O
FF
’
IF
EXTERNAL
ECHO
CANCELLATION
OR
PLAYBACK
EQUIPMENT
IS
USED
. I
T
IS
YOUR
ECHO
CANCELLER
THAT
IMPROVES
THE
AUDIO
QUALITY
EXPERIENCED
BY
THE
OTHER
SITE
. W
HEN
YOU
HEAR
AN
ECHO
OF
YOUR
OWN
AUDIO
IT
IS
MOST
LIKELY
THE
FAR
END
’
S
ECHO
CANCELLER
THAT
IS
MALFUNCTIONING
.
NOTE
