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VISION 5000 Videoconferencing SystemAdvanced use
Echo Control
========== Echo Control ==========
Mic1: Off On On+NR
Mic2: Off On On+NR
Mic3: Off On On+NR
Audio4: Off On On+NR
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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 remote site from hearing their own audio. Once selected
On 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 few seconds to re-adjust.
You can choose to switch off the echo canceller for the available audio sources.
Echo Control
Echo Control should be switched OFF if external echo cancellation or playback equipment is used. Audio 5 and 6
do not have echo cancellation since these inputs are intended for audio playback equipment.
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 remote sites echo canceller that is malfunctioning.
Noise Reduction
In addition to echo cancellation the system has built in noise reduction algorithms (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.