MENu ADDRESS
SETTINGS DESCRIPTION
INFORMATION
PRODuCT
Control Panel >
Audio >
ECHO CONTROL
MIC 1-3* AND AuDIO 4*
Lets you control the
Echo Canceller
and
Noice Reduction
at your system by configuring the Echo Control
settings.
Each of the three microphone Inputs and Audio Input 4 has a separate Acoustic Echo Canceller. One
Acoustic Echo Canceller per input provides more sophisticated control than having one common
canceller for all microphones.
The system also has built-in Noise Reduction (NR). NR reduces constant background noise (e.g. noise
from air-conditioning systems, cooling fans etc.). In addition, a high pass filter (Humfilter) reduces very
low frequency noise.
ON:
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 compensate 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.
OFF:
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.
ON+NR:
Activates both Echo Control and Noise Reduction.
NOTE!
It is your Acoustic Echo Canceller that improves the audio quality experienced by the other side.
When you hear an echo of your own audio it is most likely the far end’s Acoustic Echo Canceller that is
malfunctioning.
NOTE!
If Stereo Speakers are enabled in the menu without having any stereo speakers connected to the
Digital NAM, it may cause the acoustic echo-canceller to malfunction.
* Cisco TelePresence Codec 3000 MXP, 990/880/770 MXP, 95/75 MXP do not have Mic 3 and Audio 4
inputs.
Improving the echo canceller performance:
Place all microphones as far as possible from the
loudspeakers. Minimum loudspeaker-microphone distance
should be two meters (6.5 ft).
We recommend placing the microphones 1-2 meters away
from the persons speaking. By using several microphones,
the ratio distance loudspeaker-to-mic/mic-to-speaker
can be increased. Increasing this ratio improves the echo
canceller performance.
Place the microphones as far as possible from noise
sources.
Reduce the volume setting. Ensure that the loudspeakers do
not distort the audio.
The echo canceller tries to estimate the echo path from the
speaker system to the microphones. Moving objects change
this path; therefore try to avoid moving objects. Be especially
aware of large objects and objects placed close to either
the microphone or the speaker system as these objects will
cause severe changes to the echo path.
Avoid putting paper sheets etc. on the microphone.
Avoid moving the microphone or loudspeaker.
In the presence of low frequency noise, enable the noise
reduction (NR).
6000
3000
95/75
60
Cisco TelePresence MXP Series
Administrator guide
D14791.01 MXP Series Administrator Guide F90, August
2011.
Copyright © 2010-2011 Cisco Systems, Inc. All rights reserved.
www.cisco.com
Contents
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Introduction
The menu structure
The settings library
Getting started
Appendices
The settings library
