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Setting the USB Modes
Before beginning MediaPort 300 setup and configuration, it is important that the device be
set in the desired USB mode. Depending on which USB mode is selected, the USB host
device sees the MediaPort 300 in each mode as a different device and does not recognize
settings made in one mode to another.
NOTE: Beginning MediaPort 300 configuration before setting the desired audio mode
Standalone Mode
In Standalone audio mode, Windows enumerates the MediaPort 300 as a speakerphone,
which then signals to the Unified Communications (UC) application that AEC needs to be
applied at the UC application level in the signal chain (see
page 48 for information on how to select audio modes).
External DSP with AEC Mode
In External DSP with AEC mode, Windows enumerates the MediaPort 300 as an Echo
Cancelling Speakerphone, which then signals to the UC application that AEC is applied
at the external DSP level in the signal chain (see
how to select audio modes).
NOTE: If the MediaPort 300 is not set in the correct audio mode, three issues can occur:
requires the configuration process to be repeated. When the audio mode is changed,
the USB host repeats the enumeration with the MediaPort 300 and views it as a brand
new device.
•
A MediaPort 300, while an external DSP with AEC is in use, produces two echo
cancelling stages potentially causing adverse audio effects.
•
A MediaPort 300, while no external DSP with AEC is connected, may prevent an
echo cancelling stage from being introduced at the UC application level, producing
unwanted acoustic echo.
•
Software based AEC behavior varies per each UC client software. Setting
the MediaPort 300 to enumerate as an Echo Canceling Speakerphone does
not guarantee the UC client software disables its own software based echo
cancellation.
MediaPort 300 HDMI and Audio to USB Scaling Bridge • Theory of Operation
General Settings Page
General Settings Page
for information on
on
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