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7700 MultiFrame Manual
7736CD2 Dual Composite Decoder
8.6.2. Line 21 Processing
Video
Analog Video Processing
Line 21 setup
Remove setup,
Don't remove
setup,
Blank
8.6.3. Black Level
Video
Analog Video Processing
Black level
-128 to 127
0
8.6.4. Video Level
Video
Analog Video Processing
Video level
-180 to 75
0
8.6.5. Chroma Level
Video
Analog Video Processing
Chroma level
off,
-32 to 32
Page - 24
Closed captioning has been defined to NOT have a 7.5 IRE pedestal,
but it is placed on the first active line of video where there may be a
pedestal. This depends on the upstream closed captioning and/or
composite encoder that generated the video. When decoding
composite video with closed captioning, care must be taken to not
remove a pedestal if it is not there.
This control, when set to Don't remove setup, will not remove 7.5 IRE
pedestal from line 21. This is the default state for properly generated
captioning.
When set to Remove setup, the 7.5 IRE pedestal will be removed
from line 21. Note that this state is only valid if the preceding NTSC
Setup Pedestal control is set to "Remove".
Blank is used to remove captioning from line 21. This is most useful
for removing captioning when going into an up-converter.
This controls the black level of the decoding process. You have
greater than +/- 5 IRE range on this control.
Note: Make sure to select the proper setup pedestal removal before
setting this control. Don't set the video level control until after you
have set this control properly.
This controls the input video level of the decoding process. You have
greater than +/-4dB range on this control.
Note: Make sure to select the proper setup pedestal removal and
calibrate the black level before setting this control.
The default "off" position of this control will, in the decoding process,
correctly scale the chroma as per SMPTE-170M/125M. If you need to
adjust the chroma level or want to use chroma AGC (Automatic Gain
Control) to automatically adjust chroma gain based on the burst level,
change the value to a numerical setting that gives you proper unity
gain. The value should be near zero. You have greater than +/- 20%
(+/- 1.5dB) range with this control.
Revision 1.0.4
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