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Figure 21. depicts the signal flow in an active call condition where the HDMI output from the
codec is now automatically fed to the display. Please note that the codec has been factory
configured to exclude audio on the HDMI output. The line level output of the codec is fed
directly to the MedView internal amplifier and loudspeakers as this avoids the audio output being
heard on both the internal system speakers as well as on the main display which would potentially
cause echo at the remote location.
System Set Up Note: When setting up the codec, it is recommended to remove any external
HDMI signal connected to the infotainment input to ensure the codec output can be easily viewed
on the display.
Connecting External Audio Devices
If an external audio system (amplifier/speakers) is required,
connecting to the line level audio output disables the internal
audio, as shown in Figure 21 above.
Two auxiliary microphone inputs are available if additional
microphones are needed, such as the optional Iron Bow ceiling
microphone, part number ACC-AUDIO-C-OVERBED-A01,
which is supplied with a 25-foot cable.
Please note the microphone inputs are 4 pole, 3.5mm Jack configured to the standard Cisco
specification, allowing suitable external Cisco microphones to be connected such as the Cisco
Table Microphone 20, or equivalent.
Copyright 2021 Iron Bow Technologies
Figure 21. Signal Flow – Active Call
Figure 22. Iron Bow
Ceiling Microphone
23
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