Grass Valley 8981FS - Manual (Page 20)

14 8981FS Instruction Manual
8981FS Digital Frame Synchronizer Module
Any time the module enters the freeze mode horizontal (HANC) or vertical
(VANC) blanking interval embedded data will be removed and replaced by
black level data. This applies to both momentary freezes due to input
timing steps and manually initiated frame or field freezes. This does not
apply to EDH check words that are always recalculated and inserted in the
output signal.
Switching Line Handling
The industry standard video signal line where routing switchers should
switch (10/273 (525), 6/319 (625) can be replaced by black to remove
switching transients. Transients will occur when serial digital signals are
switched even if the signals are perfectly timed (see
Table 3 on page 15 ,
Function Switch position 5, Bank 1).
If BLANKED is selected, the nominal switching line, the H blanking
interval after it, and the first half of the following line will be replaced by
black. This will not affect any embedded audio because the H blanking
interval after the switching line should not contain any audio data.
Vertical Interval Blanking
Vertical interval active line time data can be replaced by black if desired.
This function blanks the active line time but does not interfere with any
horizontal blanking interval embedded data. The number of lines blanked
can be set to 20 or 21 in 525 to remove closed captioning. If the Vert
Blanking Data mode setting is set to PASS, all vertical blanking interval
data will pass through the module (see
Table 3 on page 15 , Function Switch
position 4, Bank 1 and position C, Bank 2).
Store/Retrieve Configuration Settings
All user configuration settings are automatically stored in non-volatile
memory a few seconds after any change. If power is lost these settings will
be recalled at power up to return the unit to its previous configuration. The
user can also store configuration settings at a different memory location for
later recall. There are also factory default settings that can be recalled to
return all parameters to known settings.
Table 3 on page 15 , Function
Switch positions D and E, Bank 2) The function settings after a recall of
factory defaults is also indicated in
Table 3 . The output signal will be timed
to match the reference signal in Frame Synchronizer mode after a recall of
factory defaults.