Keyer - Cobalt Digital Inc BBG-1000 Series Product Manual

Setup/Operating Instructions
Table 3-1 BBG-1023-DSK-LG Function Menu List — continued

Keyer

•
Note:
Keyer tab has identical independent controls for both Path 1 and Path 2 using the Path 1 / Path 2 sub-tabs. The two
key engines (Keyer 1 and Keyer 2) are available for either path and are independent of any path concerns. Total of
two key engines are available for path 1 and path 2.
•
Keyer 1 and Keyer 2 have dedicated SDI input pairs (Keyer 1 and Keyer 2 respectively use KEY/FILL SDI IN 1 and
KEY/FILL SDI IN 2 input pairs on rear panel connections).
• Key Mode Control
• Key/Fill Insertion Enable Control
• Key/Fill Status Displays
• Key Alpha/Threshold Controls
BBG-1023-DSKLG-OM (V1.2)
BBG-1023-DSK-LG Function Menu List and Descriptions
Provides key/fill insertion controls and displays
insertion status.
Selects key mode as follows:
• Alpha Ramp setting is used when typical key/fill is provided by key/fill
generator with separate key and fill outputs.
• Alpha Threshold or Reverse Alpha Threshold settings are used to
provide keying using a combined key/fill signal derived from a simple
graphic source.
Key Enable control sets up key/fill for insertion. When enabled, key
preview is available on Key Preview output.
When key preview shows desired results, Apply Key To Program can be
enabled to apply the key/fill to the program video output.
Displays keyer timing status as described below.
Note: • Key/fill timing is a function of the respective key and fill signal
frame sync card/device(s). Ideal timing is within 0 to 200 samples
early of output video timing. Key/fill source timing cannot be
controlled on BBG-1023-DSK-LG device.
• Error in key/fill timing will result in loss of keying (however,
program video image will not be corrupted).
When keying is set to Alpha Threshold or Reverse Alpha Threshold mode
sets luma thresholds, when crossed, allow key/fill onto program video
image.
Key Alpha setting, when increased, increases the opacity of the key/fill.
Key Threshold setting, when reduced, more readily allows the key/fill
input to assert itself over more variations of program video luma levels.
BBG-1023-DSK-LG PRODUCT MANUAL
Key/fill insertion OK, within target 0-200 samples early
Key or fill insertion late error (in this example, late key video
as shown by "wrap-around" line 749 lines early offset)
Key or fill video missing/mismatched format
3-19