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Vega-MV Router Multiviewer - User Manual
Issue 1 Revision 2
Page 234
© 2017 SAM
Other Common Issues and Solutions
Trouble Shooting D.4
D.4.9 Digital Audio and Analogue Bar Graphs
D.4.10 Audio Bar Color and Dolby E
D.4.11 Fixing NTP Time Discrepancies
Can I use analog bar graphs for digital inputs?
Yes.
The range colors, break points and level references are set for the scale type and NOT
for the source assigned.
For example, assuming the following settings:
•
Analog scale type: AES/EBU
•
Analog/Digital scale reference: -18dBfs
•
Analog 0dB reference: 0dBu
•
Digital upper range point: -18dBfs
•
Digital lower range point: -40dBfs
Feeding in analog 0dBu will produce a level of -18dBfs, with the color changes
occurring at -40dBfs and -18dBfs.
Changing the analog 0dB reference to +4dBu will produce a level of -22dBfs, with the
color changes unaltered.
Changing the Analog/Digital reference to -20dBfs (with the analog ref still at +4dBu) will
produce a level of -24dBfs, with color changes unaltered.
The same applies to displaying digital channels on an analog scale; the color changes
will adhere to the analog upper and lower settings.
Audio bar color selection with Dolby E sources.
For each audio meter, only two bar colors can be allocated to the pair of audio sources
that the meter is displaying. Therefore, when metering a stereo PCM pair, the left and
right channel bars can each be allocated a different color.
However, when Dolby E metadata is decoded, the meter can need to display up to eight
bars (depending on the original Dolby E mix). Normally, the color selected for the first
bar will apply to the 'left' channels, and the color selected for the second bar will apply to
the 'right' channels. E.g. in the case of a 5.1+ downmix, the color selected for the first
bar will apply to L, C, Ls and Ldownmix, and the color selected for the second bar will
apply to R, LFE, Rs and Rdownmix.
NTP time discrepancies.
For NTP to work reliably, the Vega-MV unit’s MV-NET card must also be connected to
the LAN.
This is particularly required to synchronize the time displayed when more than one
Vega-MV is working in a system.