Cobalt Digital COMPASS 9822 Downconverter - Manual (Page 55)

9822-OM (V4.1) 9822 PRODUCT MANUAL 3-23
Operating Instructions
9822 Function Submenu List and Descriptions
Framesync
Provides video Frame Sync offset and audio re-sync
tools.
• Framesync Enable Disables the Frame Sync function, or selects from choices below.
• Off: Disables Frame Sync function; output video timing matches the
input video timing.
• Reference 1: Allows Frame Sync function to use external
Reference 1 as the reference standard.
• Reference 2: Allows Frame Sync function to use external
Reference 2 as the reference 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: 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.
• Vertical Delay Control
When Framesync is enabled, sets vertical delay (in number of lines of
output video/format) 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 9822 Function Submenu List — continued