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Advanced Use TANDBERG Director Videoconferencing System
66
Echo Control
Each of the 3 microphone inputs and Audio input 4 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 continuously 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 readjust.
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.
Room Size
This setting allows optimization of the echo canceller to the acoustic size of the room. Hard walls,
many windows etc. might require higher settings than expected. Carpets, curtains etc. might
require lower settings. Adjust the setting (NOTE: on the far end) if one of the following symptoms
occur:
• There is still some echo of your own audio. Increase the setting.
• The system adapts slowly to acoustic changes in the room. Decrease the setting.
After a change, the system will need a few seconds to re-adjust.
Motion
If you experience echo caused by movements in the room, increase the value.
NOTE
ECHO CONTROL SHOULD BE
SWITCHED
‘OFF’ IF EXTERNAL
ECHO
CANCELLATION OR
PLAYBACK
EQUIPMENT IS USED. IT
IS
YOUR ECHO CANCELLER THAT
IMPROVES
THE AUDIO QUALITY
EXPERIENCED
BY THE OTHER SITE.
WHEN YOU HEAR AN ECHO OF
YOUR
OWN AUDIO IT IS MOST
LIKELY
THE FAR END’S ECHO
CANCELLER
THAT IS
MALFUNCTIONING.