Lectrosonics SPNTrio, Installation And Setup, Page: 28 / 36

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Special Section - Multi-site Bridging
LOCAL Mixes
These mixes deliver the audio from the far sides and
the microphones into the room. Signal routing for local
sound reinforcement often uses a mix-minus configura-
tion to reduce feedback in the local sound system and
echo heard at the far side. To keep picture and audio
together for a more realistic environment, telepresence
systems normally route the far side audio to loudspeak-
ers next to the video monitor for that far side.
In the following example, crosspoints are shared be-
tween far side signals and local microphones, but this is
not always the case.
AEC
Signal
Input
Ref
Input
Tel Line In
1 48 47 46 3 2
Conference Board
Mixer Board
45 44
Codec 1 Out
Codec 2 Out
Codec 2 In
Codec 1 In
Tel In + Local
Codec 1 + Local
Codec 2 + Local
Tel Line Out
AEC in (Signal Mix) AEC out ( to Far Side) AEC Reference Mi
x
AEC out ( to Far Side) AEC out ( to Far Side)
Local Mixes
Signal added to mix (matrix)
Mixes for output signals (outsource)
LOCAL Mixes
TEL and CODEC far end signals are routed
to busses feeding the local sound system
Send Mixes from previous step
NOTE: In a telepressence system, far side signals
would typically be routed to the loudspeakers
located next to the video monitor for that far side.
Microphones are routed to feed signals to
output channels feeding loudspeakers
In some acoustic spaces it is beneficial to configure
crosspoints that would normally be disabled in the
Phantom Mix mode.