Ensemble Designs BrightEye NXT 410 Clean HDMI Router - Manual (Page 60)

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BrightEye NXT 410/415/430 Compact Router Installation, Configuration and Operations Guide
Audio Reference Level
This control selects the Digital Reference Level for the audio tone
generators. This sets the nominal reference level (or 0 VU) relative to
Digital Full Scale (DFS). This relationship is expressed on a logarithmic
(decibel) scale. Since DFS is the ‘loudest’ signal that can be represented,
a setting of -18 dBFS will be 18 dB below Full Scale which is 2dB greater
than a setting of -20 dBFS. This control should be set in accordance
with the audio practice in use in your facility. Frequently, -20 dBFS is
the common practice in NTSC countries, while -18 dBFS is used in PAL
countries.
Audio Source Selection
Choose between Silence, or one of eight tone frequencies. The tone
generators produce sine waves with precision at 24 bits of quantization.
This can be verified with a digital audio distortion analyzer with a noise
floor at -144 dBFS.
Any tones that are selected will be dynamically modified if the Cyclops
control is configured for Audio Pop or Beep. (The Cyclops control adds
motion, audio pop or beep, and closed caption elements to the video
test signal which proves that the signal reaching a given destination is a
true live signal and not a freeze frame from a frame synchronizer that has
lost its input.)
Audio Group Enable
Each of the four possible audio groups can be Enabled independently.