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Figure 10. Panning position of each microphone element to create the stereo immersive image.
5.3 SoundStructure Channels Settings
The audio settings for the SoundStructure Conference Link connection method example are shown in the
following figure and described in detail below. In this figure the microphone group has been collapsed
and any changes made to the group will change the values for all microphones that are members of the
group.
1. The Acoustic echo Canceller is enabled and the AEC reference for all the microphones is set to
the “Amplifier” submix signal. This ensures that the acoustic echo canceller knows what audio to
remove from the microphones when the remote talkers’ audio is picked up by the local
microphones.
2. The input fader on the HDX ceiling microphones is set to 6dB.
3. The output level to the audio amplifier channels is set to -10dB to be compatible with consumer
level audio amplifiers (RCA connections). If the in-room amplifiers are professional grade
amplifiers and support 0dBu or +4dBu nominal signal levels then these level settings can be set
to 0dB or +4dB respectively. If the amplifiers use RCA signal connections, leave these values at
-10dB to prevent overdriving the audio inputs on the amplifier.
4. The optional in-room ceiling fill loudspeaker output is delayed 10msec to allow the local
participants to ‘hear’ the audio from the front of the room and have the optional ceiling
loudspeakers provide some ‘fill’ without drawing attention away from the front loudspeakers. The
optional ceiling fill is recommended for rooms that are larger than 20ft (6m) in depth from the back
of the room to the front of the room. The delay is added to ensure the focus of the local
participants is on the audio from the front display wall and not from the audio from the ceiling. The
delay may be increased above 10msec if the ceiling loudspeakers are far from the front
loudspeakers.
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