Nevion FRS-HD-CHO - Manual (Page 23)

FRS-HD-CHO Rev. 9
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If sync input reappears
Given that a stable SDI input exists: If the sync signal reappears the delay mode will change
back to Frame Sync mode. Hence the internal clock will be locked to the sync signal and the
delay will again change.
NOTE: This will result in a frame roll as the delay changes.
If both signals disappears
The picture will first freeze for <hold time> and then go to video generator. The output is now
referenced to the local clock source. However this clock source will be kept within 1 ppm of
the last sync source.
5.5.2 Frame delay mode
In this mode a sync signal is not present. The delay set is then directly related to the
incoming video. 1 frame and 1 line delay, means that the output will be 1 frame and 1 line
delayed version of the input.
If video signal disappears
The picture will first freeze <hold time> and then go to video generator. The output is now
referenced to the local clock source. However this clock source will be kept within 1 ppm of
the last video source.
If video signal reappears
If the input video signal reappears, the video will reappear on the output <lock time> after
stable input video. The delay will be set to the same delay as before loosing input.
NOTE: This may cause a frame roll.
If a sync input appears
Given that a stable SDI input exists: If a sync signal appears the delay mode will change to
Frame Sync mode, see Chapter 5.5.1. Hence the internal clock will be locked to the sync
signal and the delay will again change.
NOTE: This will result in a frame roll as the delay changes.
5.6 Video generator
The video generator can produce several simple signals: Color bar, Check field and flat field.
The flat field is possible to set up with 10bit (0-1023) luma and chroma values, or by
selecting a color.
The generator may be used as the video source if there is no video signal present at either of
the video inputs. The generator may also be switched on with Gyda. This will override video
input but the generator signal will be locked to the input.
Figure 15: Gyda view of the video generator