Grass Valley AMX-3981 2014 - Manual (Page 24)

GUIDE TO INSTALLATION AND OPERATION
18 | AMX-3981
5.2.3 Freeze tab
Freeze type: This is a pull-down menu with four
options – FIELD 1, FIELD 2, FRAME and BLACK. It
determines the manner in which the AMX-3981
responds to a manual freeze, a video input switch
(“hotswitch” as defined by SMPTE recommended
practice RP-168, revised January 2002), a loss of
input signal or other input errors. The four possible
options yield the following results:
Freeze Type Auto Freeze Mode Manual Freeze Mode
• Field 1
Freeze to last valid FIELD
Freeze to last valid FIELD 1
• Field 2 Freeze to last valid FIELD 2
• Frame Freeze to last valid FRAME
• Black Freeze to BLACK
Auto Freeze: This pulldown (ON/OFF) enables or disables the auto freeze function. In Auto Freeze mode, a
reference must be present to ensure a glitchless output when a freeze is activated. There are only two freeze
possibilities in Auto mode: freeze to last valid Field or freeze to black. When Auto Freeze mode is disabled, the
content of the active picture will reflect whatever garbage is present at the input but, if a reference is present, the
output synchronization will be maintained to avoid unlocking downstream equipment.
Activate Manual Freeze: Select this checkbox to immediately freeze the output according to the selected Freeze
Type mode.
Note: The manual freeze setting is saved in the non-volatile memory of the card. If the manual freeze is activated and
the power is cycled, the card will start in freeze mode at the next power-up and the output will be invalid. Just turn off
the manual freeze to restore the output.
In all cases, audio will be muted when there is an
input error. See the audio section for more
information.
5.2.4 Timing tab
The Timing tab provides access to timing
adjustments which affect the signal outputs.
There are three slider controls, each with a data
reporting box which shows the current value, and
into which values can be typed directly. The total
delay is reported at the top of the window.
Vertical (lines): With this adjustment, a value
ranging from –16 to +16 lines compared to the
reference or the processing delay may be set.
This adjustment can be used in conjunction with
the horizontal timing adjustment.
Figure 5.5 Video Input/Output – Freeze tab
Figure 5.6 Video Input/Output – Timing tab