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TANDBERG Videoconferencing SystemAdvanced use
Audio input 4 is intended for connection to a VCR. 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
source connected to this input will be heard from the local speaker. If ‘Auto’ is selected, the audio from the VCR
will only be heard when VCR is selected as video source.
Mix Mode
‘Auto’ automatically adjusts the weighting of each microphone to obtain the best possible audio and minimizes
the background noise. ‘Auto’ will also attenuate the VCR audio level when someone talks into a microphone.
‘Fixed’ will maintain a constant weighting for all microphones.
Level Settings
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 AT871 microphone in an average
videoconferencing room. The gain can be adjusted correctly for a wide range of microphones.
A few examples of microphone levels are:
Audio Technica AT871 +3dB (default with system)
Audio Technica AT851R +7dB
TANDBERG Audio Science +19.5dB
Audio inputs 3 and 4 are set to a default level which is adhered to by most manufacturers of audio-visual
equipment and is a level at which most audio-visual equipment (CD-players, VCRs) will work.
Level Settings
Mic1: ||——— +3.0dB
Mic2: ||——— +3.0dB
Audio3(AUX): ||||||—— +9.0dB
Audio4(VCR): ||||||—— +9.0dB
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