Nevion DAC-AVA-DMUX - Manual (Page 16)

DAC-AVA-DMUX Rev. A
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In addition to the DIP switches, manual mode will also activate the rotary switch and the two
push-buttons at the front of the module. These are used to control the phase delay for the
sync-pulse generator.
3.5 A very brief guide to Multicon Gyda mode set-up
All of these settings are covered in more detail in chapter 4.3 , ‘Detailed control in Gyda
mode ’. These are just the most important settings to get started:
Arguably the most important setting is where to take the input from. If the module was
purchased with the electrical input only, this would be a good starting point:
What this means is that the electrical input will be chosen whenever a signal is present, and
if a signal is not present, the output will frame freeze for 500 ms before resorting to an
internal fallback generator. Here this generator is set to produce just black video frames.
If the module was purchased with the optical input option, the setup could either be like
above, or
most likely the ‘Optical’ input would take the place of the ‘Electrical’ input in the
illustration above. Alternatively, one input could serve as a backup for the other, with a final
fallback to generator, as illustrated below:
The rest of the settings on the configuration page either deal with setup of the frame
synchronizer, or with the selection of formats for the module outputs. See chapter 4.3.7
for
more detailed description of all the available options.
Once the input is taken care of, the output should be configured. The video DAC has three
BNC outputs that can be configured to have these combinations (for SD output):
- CVBS/CVBS/CVBS
- CVBS/Y/C
- Y/Pb/Pr
- R/G/B
When the output is HD, the output setting will be overridden and the output will always be
Y/Pb/Pr. For CVBS and S-Video the following modulations are available:
- PAL B/G
- NTSC
- PAL M
- PAL N
The board can handle 50Hz-based input signals as well as 60Hz-based (with and without
pull-down) but it
can’t convert a 50Hz-based input to a 60Hz-based output and vice versa.
The modulation setting is therefore split in two, one to select between NTSC and PAL M
output for 60Hz-based sources, and one to select between PAL B/G and PAL N for 50Hz-
based sources.
The B lack setup (“pedestal”) “On” or “Off” setting only applies to NTSC.