GRASS VALLEY 8995DNC -, Instruction Manual

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8995UPC/DNC/UDX — Instruction Manual 59
Configuration
Loss of Signal Operation
Set the operation to be performed by the module upon loss of input signal
when an external reference is present (
Auto Blue
,
Auto Freeze
, or
Pass
).
When there is no external reference (output timing set to Input), the
module will default to pass the signal to the output.
Manual Freeze Mode
Select one of the radio buttons (
Frame
or
Field
) to perform a manual freeze
on the output
.
Delay Wrap Position
This indicator will display with a blue bar, the fraction of the final frame of
actual video delay through the frame sync.
Note It will not indicate if multiple frames have been selected with the Multi-Frame
Delay control.
For example, with 1080i video and Minimum Delay Mode not selected, if
600 lines plus 5 frames of delay is entered by the user, that actual delay
through the module will be anywhere from about 6 to 7 frames depending
on the following conditions:
a. If the module is in Delay (Input-Timed) Mode, the delay through
the module will be about 6.5 frames, and the Delay Wrap Position
will be at about 50% of full scale.
b. If the module is in Frame Sync (Genlock) Mode, the delay through
the module will be about 6.5 frames if the input video has zero
delay with respect to the genlock reference frame position, and the
Delay Wrap Position will be at about 50% of full scale. As this input
video delay with respect to the genlock reference frame position is
changed from -0.5 to +0.5 frame periods, the delay through the
module will change from about 6 to 7 frame periods, with the Delay
Wrap Position changing from about 0 to 100% of full scale.
In summary, the Electrical Length of the module can be estimated as the fol-
lowing:
• 1 frame minus 5 lines (Minimum Delay Mode not selected), or
• 150 pixels (Minimum Delay Mode selected) + Multi-Frame Delay +
Delay Wrap Position (% of full scale) X (1 frame period).
When converting from an interlaced to a progressive signal, the timing
status will be noted as shown in
Figure 35 on page 61 .