NCast Telepresenter M4 - Manual (Page 72)

NCast Telepresenter Reference Manual
When the Audio Meter pushbutton is on, two pairs of audio meters appear on the local loopback display
connected to the Telepresenter. The audio meter window is never transmitted over the network nor recorded
as part of the media stream.
The stereo meters on the left show local audio activity originating from the microphone or line-level inputs.
The stereo meters on the right show network activity, that is, strength of the audio derived from the incoming
media stream in full-duplex or collaboration mode.
The local meters are useful to check for proper connectivity and activity of the sound system connected to
the Telepresenter. The levels should be checked for proper range, and gains should be changed if the audio
is too hot or soft.
The Audio Meter positioning controls (Top-left, Top-right, Bottom-left, Bottom-right) allow the meter display to
be set in an area of the screen that does not obscure other important windows (like the PIP window, for
example).
6.1.9. Main Window
The placement of the Main window may be altered after Session start with this menu selection. Custom
Windows 1-10 are defined on the Custom page under the Configuration Tab.
The position of this window is OVERWRITTEN during Session start using values from the Channel Table.
6.1.10. PIP Window
The placement of the PIP window may be altered after Session start with this menu selection. Custom
Windows 1-10 are defined on the Custom page under the Configuration Tab.
The position of this window is OVERWRITTEN during Session start using values from the Channel Table.
6.1.11. Audio Microphone Gain
The audio microphone gain adjusts the signal level from the microphone to the input of the AC’97 codec.
A reference signal of –40.0 dBu ( 7.75 mV RMS) will produce maximum sample values when the Mic Gain is
set to a value of approximately 90. If this is considered the internal 0.0 dB signal reference, the chart shows
gain adjustments for different values of Mic Gain.
6.1.12. Audio Line-In Gain
The audio line-in gain adjusts the signal level from the line-in connector to the input of the AC’97 codec.
A reference signal of 0.0 dBu (0.775 V RMS) on the line-in connector will produce maximum sample values
with the line-in gain set to approximately 40. If this is considered the internal 0.0 dB signal reference, the
chart shows gain adjustments for different values of Line-in Gain.
If recording in Mono, make sure the active audio is available on the LEFT channel.
6.1.13. Audio Output Gain
The audio output gain adjusts the signal level from the AC’97 codec to the line-out connector. This signal
powers the local speakers (after suitable amplification) and delivers the audio media stream to the audience.
For a 0.0 dB reference signal (maximum sample values) the measured output levels in dBu are shown in the
chart.
6.1.14. Audio Loopback Gain
Allows input audio to be looped back to the output connector. The normal use of this loopback is for
confidence checking of the input audio on a control monitor or speaker. If input microphones are able to
pickup this output signal, serious feedback loops (whine) will result. Setting this value to non-zero where
speakers and microphones are in the same space is not recommended.
NCast Corporation Revision 2.2
Page 72