Cobalt Digital COMPASS 9083 HD_SD Frame Sync - Manual (Page 57)

9083-OM (V4.5) 9083 PRODUCT MANUAL 3-15
Operating Instructions
9083 Function Submenu List and Descriptions
Framesync
Provides video Frame Sync delay control and audio
re-sync tools.
• Framesync Enable Disables the Frame Sync function, or selects from choices below.
• Off: Video path bypasses frame sync entirely; output video timing
tracks with input video timing.
• Reference 1: Allows Frame Sync function to use external
Reference 1 as the reference (“house”) standard.
• Reference 2: Allows Frame Sync function to use external
Reference 2 as the reference (“house”) standard.
Note: If Reference 1 or Reference 2 is selected and an
appropriate external reference is not received, the
indication appears in the Card Info
status portion of DashBoard™, indicating invalid frame sync
reference error. (Additionally, the card edge ERR indicator
illuminates indicating the same.) External reference signals
Reference 1 and Reference 2 are distributed to the card
and other cards via a frame bus.
• Input Video: Allows full framesync functionality (such as delay
offset), but instead uses the input video signal as the reference
standard.
Note: • If Input Video is used for framesync, any timing instability
on the input video will result in corresponding instability on
the output video. This setting should only be used where
syncing to input video is known to be reliable.
• Negative vertical or horizontal delay values (using the
controls below) should not be used when using Input
Video mode. This may result in image motion “jerkiness”.
To add an offset in this case, instead apply a positive value
that results in the desired net offset.
• Vertical Delay Control When Framesync is enabled, sets vertical delay (in number of lines of
output video timing) between the output video and the frame sync
reference.
(Range is -1124 thru 1124 lines.)
Note: Lines refer to lines in the output video format, and not to the
reference format.
• Horizontal Delay Control When Framesync is enabled, sets (in µsec of output video timing)
horizontal delay between the output video and the frame sync reference.
(Range is -64.000 thru 64.000 µsec)
Note: When an external framesync reference is used, the card will not
produce a framesync reset until the variance between framesync
reference and output video exceeds ± 2 clock periods. Therefore, a
framesync reset will not result if offsets within this window are
applied.
To apply an offset/framesync reset within this window, first apply a
relatively large offset, then apply the target smaller offset.
Example: To apply a 1-period offset, first apply a 10-period positive
offset and then apply a 9-period negative offset. This results in the
target 1-period offset being applied to the output video.
Table 3-2 9083 Function Submenu List — continued