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7700 MultiFrame Manual
7735CEM Composite Encoder with Monitoring
7.10.9. Detecting Loss of Primary Captioning
Fault definitions
Loss of CC duration
2 to 512 sec in 2 sec
increments
180 sec
7.10.10.
Detecting Loss of Program Rating Duration
Fault definitions
Loss of PR duration
1 to 255 sec
30 sec
7.10.11.
Detecting Picture Freeze
The Picture noise level and Picture freeze duration controls are used to detect when a video picture is
considered to be frozen. The Picture noise level control sets the threshold that decides whether activity in
the picture is considered to be noise. The picture activity must be greater than this amount for the duration
set by the Picture freeze duration control before the fault condition exists.
7.10.11.1.
Setting the Picture Noise Level
Fault definitions
Picture noise level
1 to 10
7
As a guide, the following chart is the approximate picture noise level that starts to be interpreted as motion
for each of the Picture noise level settings:
* RMS noise relative to 714mV, 15kHz to 4.2Mhz bandwidth, VHF noise added to a static test signal, noise
duration set to 30 frames.
7735CEM-50
Gray background indicate un-implemented or un-tested features
This control sets the amount of time in seconds with no primary CC1
captions encoded, which is considered a fault.
This fault condition will also be generated if the closed caption signal is
missing on the input video.
This control sets the amount of time in seconds with no program rating
packet encoded in the Line 21 XDS data stream, which is considered a
fault
This fault condition will also be generated if the closed caption signal is
missing on the input video.
This control sets the approximate level of noise expected in the video
signal feed. It is used by the freeze detect feature to distinguish motion
from background noise on top of a video feed.
For noisy video feeds, higher numbers are needed.
Picture noise
Noise that starts to be
level
interpreted as motion * (dBrms)
1
-43
2
-42
3
-41
4
-39
5
-38
6
-37
7
-36
8
-34
9
-31
10
-28
Revision 1.1.1
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