Grass Valley 3DX-3901 - Manual (Page 20)

GUIDE TO INSTALLATION AND OPERATION
16 | 3DX-3901
Horizontal (µs): With this adjustment, a value ranging from zero to the equivalent of 1 horizontal line in the current
operating format compared to the reference or the frame boundary may be set.
Additional Frame Delay: This parameter affects the overall processing delay of the card. It adds supplemental
frame delay to the current processing delay. This parameter will add a delay ranging from 0 to 6 frames (steps of 33
ms in 59.94 Hz and 40 ms in 50 Hz) to the current processing delay. Without a reference, the normal processing
delay is 1 frame. You can extend this delay up to 7 frames if the additional delay is 6. With a reference, up to 6
frames can be added to the frame sync delay which depends on the timings between the input and the reference.
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 3DX-3901 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 Option Auto Freeze Mode Manual 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 mode selected in
the Freeze Type pull-down.
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.
Figure 3.7 Input/Output - Freeze tab