MediaPort 200 • Theory of Operation
17
Setting Audio Modes
Before beginning the setup and configuration of the MediaPort 200, it is important that
the device be set in the desired audio mode. Depending on which audio mode is selected
(Standalone or External DSP with AEC), Windows sees the MediaPort in each mode as a
different device and does not retain settings made in one mode to another.
NOTE:
Beginning configuration of the MediaPort 200 before setting the desired audio
mode requires the configuration process to be repeated, as when the audio mode is
changed, Windows views the MediaPort as a different device.
Standalone Mode
In
Standalone
audio mode, Windows enumerates the MediaPort 200 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 59 for information on how to select audio modes.
External DSP with AEC Mode
In
External DSP with AEC
mode, Windows enumerates the MediaPort 200 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
on page 59 for
information on how to select audio modes.
NOTES:
If the MediaPort 200 is not set in the correct audio mode, two major issues can
occur:
•
A MediaPort set in Standalone audio mode, while an external DSP with AEC is in
use, produces two echo cancelling stages potentially causing adverse audio effects.
•
A MediaPort set in External DSP with AEC audio mode 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.
