MediaPort 200 • Theory of Operation
16
AEC Ref and Aux Outputs
These two outputs provide special routing capabilities that make it easy to use the
MediaPort 200 with an external DSP with AEC and/or a hardware video conferencing device
(video codec). The Ref output carries the only far end USB communications audio, while the
Aux output carries only the audio signal from the MediaPort Mic/Line input.
Figure 10 below highlights the routing to these two outputs. There are no master controls
for these signal paths. Level is set on the input gain controls and the output attenuation
controls.
Set the input gain for optimal signal levels in the
Input
page 51). Settings for Ref and Aux outputs attenuation controls may remain at 0 dB for
unity gain in most cases. Adjust the output controls if the device connected to these outputs
requires a lower signal level, though it is recommended to adjust the input level of the
connected device in this case.
HDMI IN R
LINE IN L
GAIN
GAIN
GAIN
GAIN
USB COMMUNICATIONS L
USB COMMUNICATIONS R
GAIN
GAIN
GAIN
GAIN
LINE IN R
GAIN
GAIN
GAIN
DUCKER
DUCKER
HDMI IN L
GAIN
USB PLAYBACK L
USB PLAYBACK R
GAIN
GAIN
GAIN
GAIN
COMP
COMP
COMP
COMP
FLT
FLT
FLT
FLT
COMP
COMP
FLT
FLT
COMP
COMP
FLT
FLT
MIC/LINE IN
GAIN
DUCKER
GAIN
COMP
FLT
USB OUT L
USB OUT R
LINE OUT L
LINE OUT R
LIM
LIM
LIM
LIM
FLT
FLT
FLT
FLT
ATT
ATT
ATT
ATT
SIG
GEN
SIG
GEN
SIG
GEN
SIG
GEN
REF OUT
ATT
SIG
GEN
AUX OUT
ATT
SIG
GEN
Figure 10.
AEC Ref and Aux Out Routing (Example)
figure 10.
AEC Ref and Aux Out Routing
