Vega 30 Router User Manual
Line Synchronizer and Offset from Reference
Output Video Timing - Line Sync and Offset 8.1
Issue1 Revision 1
Page 154
© 2017 SAM
8
Output Video Timing - Line Sync and Offset
8.1 Line Synchronizer and Offset from Reference
Each switched video output can be independently line-synchronized and, if required, delayed
from the reference timing. The licensed options VG10-CSx are required for this feature. The
functions licensed are:
•
Line Synchronizing
- synchronizes the router output to the video reference
according to the routed input’s switching video standard.
•
Delay
- if required, delay can be added into each router output to offset the output
signal timing from the reference signal timing.
These two functions are both implemented within the unit using video storage buffering on a
per router output
basis. They both share the video buffer storage on each output.
8.1.1 Buffer Storage Capacity
The buffer storage capability varies according to video standard. Table 50 lists the storage
capability for the video buffer block for each supported video standard.
The amount of storage used for line-synchronizing depends on the relative timing relationship
between each router input signal and the video reference. The remaining buffer storage
capacity for each output can be used to offset (i.e. delay) each router output from the video
reference.
If all router video input signal timings are co-timed with reference to ±½ line, then a router
output can then typically be delayed by up to a further 14 lines regardless of standard.
Note:
For each output, video buffer storage is used for:
Line-synchronizing and Output
delay
Video Switching
Standard
Pixels
per line
Buffer Store Capacity
(Video Samples)
Lines
Pixels
SD525
858
38
163
SD625
864
37
799
HD1080i50
2640
12
1087
HD1080i59
2200
14
1966
HD1080i60
2200
14
1966
HD1080p50
2640
12
1087
HD1080p59
2200
14
1966
HD1080p60
2200
14
1966
HD720p50
1980
16
1087
HD720p59
1650
19
1417
HD720p60
1650
19
1417
Table 50
Video Buffer Block Storage Capability
Note:
Buffer storage capacity =
Storage used for Line-sync
+
Storage used for delaying output.
