TANDBERG 3000 MXP User Manual
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If Out 1 Mode is set to Auto, the system will select analog or digital (SPDIF) mode dependent
on the detected Audio Module. If a TANDBERG Digital NAM is detected, SPDIF mode will be
selected, otherwise analog mode will be selected.
Setting the Out 1 Mode to either Analog or SPDIF will override the auto-detected mode.
Audio Module
Select Audio Module according to the type of Audio Module installed if this is not
automatically detected. The Audio Module setting is only available if the audio module of the
system is unidentified.
Level Settings
Adjust the audio output levels according to the parameters of the external audio equipment
connected. These levels should only be adjusted when installing new audio equipment. The
default settings are correct for the TANDBERG Digital Natural Audio module and for most
consumer electronics devices (televisions, VCRs, etc.). The volume keys on the remote
control adjust the level of output 1 (the speaker output). The volume control has no effect on
other outputs.
4.5.3 Echo Control Mic 1-2 and Audio 3
Each of the 2 microphone inputs and Audio input 3 has a separate acoustic echo canceller.
One echo canceller per input provides more sophisticated control than having one common
canceller for all microphones.
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 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 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.
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 that 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.
Tips for improving the echo canceller performance: