Grass Valley 8981FS - Manual (Page 17)

8981FS Instruction Manual 11
Configuration
setting does not result in at least this much signal delay from video input
to output, the module will delay the signal up to one frame. The output
timing controls can adjust the serial digital output timing:
■ ± 1 field, in 1 H-line steps and
■ Over 1 line in 37 ns steps.
Total timing range is slightly greater than one full frame.
If the Restore Defaults configuration is recalled, the serial digital output
timing will revert to providing a video output exactly in time with the ref-
erence input.
If the Reference input signal is lost, the module will revert to the fixed delay
operating mode. The video output signal will continue to be present. The
audio delay control output will continue to function.
Fixed Delay Mode
The Frame Sync function can be turned off to operate the module as a fixed
video signal delay of up to one frame. In this mode no reference input is
required. Delay is adjustable:
■ From two lines to one frame in one line steps and
■ In 37 ns steps over one horizontal line.
Input Signal Loss
Upon input signal loss the, the user can select between three output signal
options:
■ Freeze of the last good field (Auto-freeze)
■ Force the output to black, or
■ Pass the input signal as is.
To select a freeze of the last good field the Auto-freeze mode should be
ENABLED and the Output With No Input mode should be set to PASS. (See
Table 3 on page 15 , Function Switch positions 7 and 8, Bank 1)
To select a black output signal the Output With No Input mode should be
set to BLACK. This function will override video freezes if the input signal
is lost. For automatic freezes to cover input signal Hot Switches, ENABLE
the Auto-freeze mode.
To pass the input signal as is without a last good field freeze or forced black
Auto-freeze mode should be set to DISABLE and Output With No Input
should be set to PASS. In this mode automatic freezes are disabled and non-
synchronous input signal hot switches will appear in the output signal.