TANDBERG F1 D13642.01 - Manual (Page 85)

4 Administrator Settings
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Tips for improving the echo canceller performance:
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It is recommended to place the microphone between 1 and 2 meters away from the
persons speaking.
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Place the microphone as far as possible from noise sources.
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Reduce the volume setting. Ensure that the loudspeakers do not distort the audio.
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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.
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Avoid putting paper sheets etc. on the microphone.
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Avoid moving the microphone or loudspeaker.
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In the presence of low frequency noise, enable the noise reduction (NR).
4.5.4 Stereo Settings
(not for TANDBERG 1500 MXP and 2000 MXP, software version F1)
Stereo Input mode (stereo audio)
If Stereo Input mode is on, Audio in L/R (VCR Left/Right) will behave as a stereo input pair.
The VCR Ducking and AGC setting for Audio in R will in this case apply to both Audio in L
and R.
Audio out to the left loudspeaker will be a mix of Audio in L (VCR Left), the microphones and
the far end signal (left or mono), and Audio out to the right loudspeaker will be a mix of Audio
in R (VCR Right), the microphones and the far end signal (right or mono).
If Stereo Input Mode is off, Audio out to both loudspeakers will be a mix of Audio in L and R,
the microphones and the far end (mono or left+right).
4.5.5 Audio Levelling (AGC)
On Select On to allow automatic adjustments (Automatic Gain Control) of audio
levels. When On, the AGC maintains the audio signal level at a fixed value by
attenuating strong signals and amplifying weak signals. Very weak signals, i.e.
noise alone, will not be amplified.
Off Audio levelling is not activated.
Note that to ensure correct behaviour of the AGC, it is crucial that the levels on the input
connectors are adjusted correctly using the audio input level settings. The AGC will not
compensate for severe maladjustment of input levels.
When applying a weak signal in the presence of strong background noise, the AGC might
amplify the background noise as well as the signal. Therefore, in noisy environments, it is
advisable to turn the AGC off.