Line Output; Ref/Aux Out - Extron electronics MediaPort 200 User Manual

Line Output

The line output is used to connect to a local sound reinforcement system. All line input
program sources, plus the USB Communications audio from the far end, are mixed to the
line output. In an application that uses a DSP processor in conjunction with the MediaPort
200, the analog line output will be connected to the DSP processor as an AEC reference for
the program material, and then sent to local sound reinforcement from the DSP processor.
In this case, USB communications audio (far end) will be muted to the line output and sent
to the DSP processor via the AEC reference output (see section,
page 10 for more information).
USB Communications audio from the far end is always routed to the AEC Out. This is
intended for use with a DSP processor, so that far end USB Communications audio can
be used as an AEC reference in the DSP, and then sent to the local sound reinforcement
system from the DSP processor. When USB Communications audio is muted to the line
output, the line output will send only program audio to the DSP processor. This allows
program audio to be managed separately from USB Communications audio. Program audio
may also be used as an AEC reference, and either mixed to the same sound system as USB
Communications audio or sent to a separate sound system.

Ref/Aux Out

The AEC "Ref" output is used in conjunction with a DSP processor using multiple
microphones with distributed AEC (i.e., an AEC processor on every microphone channel).
Only USB far end audio is routed directly to the AEC reference output. Alternatively, the AEC
output can be used to send USB Communications audio to a separate sound system from
program audio mixed to the line output. In this case, USB Communications audio would be
muted to the line output.
The Aux Out contains only the mic input signal from the MediaPort 200. This facilitates
connecting both the MediaPort 200 and a hardware codec when the same mic applied to
the MediaPort 200 is to be simultaneously used as the mic source for the hardware codec.
MediaPort 200 Audio Application Tutorial • Audio Application Setup
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