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Theory of Operation
This section contains a discussion on how the MediaPort 300 can be implemented. The
following topics are discussed:
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MediaPort 300 Operational Modes
The MediaPort 300 works with a computer "soft-conferencing" application to create a fully
interated conferencing environment. The MediaPort 300 is recognized by the host device as
either a speakerphone, webcam, or an echo cancelling speakerphone, depending on which
audio mode is enabled. The MediaPort 300 connects to a sound system and computer to
bring the far end audio and video into the local room, as well as program audio from the
computer or one of the MediaPort 300 line-level inputs. The MediaPort 300 accepts a single
microphone at the mic/line input or can accept a microphone mix from an external DSP
matrix processor. The following MediaPort 300 USB modes are selectable in Extron PCS:
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It is important to select the correct mode before configuring the MediaPort 300 with the
host device. Changing the audio mode causes the MediaPort 300 to reboot, after which
the computer recognizes the MediaPort 300 as a new USB device in the newly established
mode (see
MediaPort 300 Signal Flow
This section provides a more advanced understanding of the MediaPort 300 signal flow.
The MediaPort 300 fits into multiple conferencing applications with little or no additional
configuration other than setting proper gain structure and run-time mix levels.
Matrix Routing
Figure 3
default configuration and available processing.
through 11 specifically show the sub-controls (points in the mix matrix, or "mix-points") for
various audio output configurations.
MediaPort 300 Operational Modes
MediaPort 300 Signal Flow
Master Volume Controls
Setting the USB Modes
No USB host enumeration
Non-Echo Cancelling Speakerphone & Webcam
Echo Cancelling Speakerphone & Webcam
Non-Echo Cancelling Speakerphone Only
Echo Cancelling Speakerphone Only
Webcam Only
Setting USB Modes
on the next page is a basic signal flow block diagram showing the MediaPort 300
MediaPort 300 HDMI and Audio to USB Scaling Bridge • Theory of Operation
on page 13 or more information).
Figure 4
through
figure 6
on pages 9
7
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