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TANDBERG Videoconferencing System
61
Advanced use
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 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.
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.
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.
NOTE