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D1335603_T770_880_990_MXP_User_Manual
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4.5.1 Inputs
Mic 1- 2 and Audio input 3-4
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. The activated audio sources are stored
on camera presets.
Mic 1 and 2 are intended for electret type microphones. The microphone inputs are balanced with
24V phantom power.
Audio input 3 (AUX) is intended for connection to external playback devices. As there is no
acoustic echo canceller on this input it should not be connected to any microphones. The audio
source connected to this input will be heard from the local speaker as well.
Audio input 4 (VCR) is intended for connection to a VCR or DVD player. It can also be connected
to other external playback devices. As there is no acoustic echo canceller on this input it should
not be connected to any microphones. The audio entering this input will be heard from the local
speaker as well. If Auto is selected, the audio from the VCR will only be heard when VCR is
selected as video source.
Mix Mode
Auto
The adjustment of each microphone signal is done automatically to obtain the best
possible audio and minimize the background noise.
Fixed
Fixed will maintain a constant weighting of all microphones.
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 audio input 4. If input 3 and 4 is configured to one stereo input
pair, see 4.5.4 Stereo Settings, then the VCR ducking will apply to both input 3 and 4.
Level Settings
It is possible to adjust the audio input levels according to which external audio equipment 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 preferred level
marker. The audio inputs are adjustable in steps of 1.5 dB from 0 dB to 22.5 dB.
The default levels for Mic 1 and 2 are set for use with an Audio Technica AT871R or AT841R
microphone in an average videoconferencing room. The gain can be adjusted correctly for a wide
range of microphones.