Extron electronics mediaport 200, Руководство пользователя

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MediaPort 200 • Theory of Operation 7
Theory of Operation
This section contains a discussion on how the MediaPort 200 can be implemented,
including its two audio modes. Additionally, this section covers the signal flow within the
MediaPort 200 in these two modes. The following topics are discussed:
•
MediaPort 200 Operational Modes
• Speakerphones and AEC (Acoustic Echo Cancellation)
• Standalone Mode
• External DSP with AEC Mode
•
MediaPort 200 Signal Flow
• Setting Audio Modes
MediaPort 200 Operational Modes
The MediaPort works in conjunction with a computer “soft-conferencing” application to
create a hands-free conferencing environment, and is recognized by the host computer as
either a speakerphone or an echo cancelling speakerphone, depending on which audio
mode is enabled. The MediaPort 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 line-level inputs. The MediaPort accepts a single microphone at the
Mic/Line input, or can accept a microphone mix from an external DSP matrix processor.
The following MediaPort audio modes are selectable in the Extron Product Configuration
software:
• Standalone (no external DSP) – This is the default setting. In this mode, the
computer recognizes the MediaPort as a
Speakerphone
and applies echo-cancellation
in the unified communications software. This mode is intended for use with a single
microphone connected to the Mic/Line input.
• External DSP with AEC – In this mode, the computer recognizes the MediaPort as
an
Echo Cancelling Speakerphone
which is intended to prevent AEC from being
applied in the unified communications software. This mode is intended for use when a
mic mix from an external DSP matrix processor with AEC (acoustic echo cancellation) is
connected to the Mic/Line input.
It is important to select the correct mode before configuring the MediaPort 200 with the
host computer. Changing the audio mode causes the MediaPort to reboot, after which the
computer recognizes the MediaPort as a different device in the newly established mode (see
Setting Audio Modes on page 17 for more information).