User manual

Administrator Settings
151
4.5.1 Inputs
Mic and Audio input L-R (VCR Left/Right)
By default, all inputs are enabled. Just plug in an audio source and it is active. Audio inputs that
are On will automatically be mixed. Unconnected inputs will automatically be muted. Select Off to
prevent audio/noise from connected but unused inputs.
Audio inputs L-R (Left/Right) are intended for connection to a VCR, DVD player or PC audio
output. They can also be connected to other external playback devices. As there is no acoustic
echo canceller on these inputs they should not be connected to any microphones. The audio
entering these inputs will be heard from the local speaker as well.
VCR Ducking
If VCR Ducking is activated, the VCR audio level will be attenuated if someone talks into the
microphone or at the far end.
The VCR ducking is only valid for AudioR. If audio inputs AudioL and AudioR are configured to
one stereo input pair, see Stereo Settings
, then the VCR ducking will apply to both input L and R.
Level Settings
It is possible to adjust the audio input level according to which audio equipment that is connected.
The on-screen audio level indicator will make it easier to set the correct input level settings. The
input level should be adjusted so that the average level reaches the transition between the green
and the yellow area. The audio inputs are adjustable in steps of +1.5 dB from 0 dB to +22.5 dB.
To help adjusting the input levels there is also a Peak Performance meter showing the peak
audio volume for each of the audio inputs. The level should be adjusted so that the Peak
Performance meter never reaches the maximum value to avoid the acoustic echo canceller to
malfunction due to overload of the microphone.
The default level for the microphone is set to +3 dB.