Snell & Wilcox SD1012, Руководство по установке

Страница: 18 / 53

Page SD1012 Installation Manual - Issue 6, Rev 1 S&W Production & Post Production 10
SYSTEM INTERCONNECTION - continued
Referencing - System Delays
The delay through the Golden DaVE system is illustrated in the timing diagram on the next page.
With no option (OPT) card the minimum delay which is possible is 185 pixels (about 14µs), but as
the diagram shows, with a DVE card fitted a delay of over 2 frames is easily achievable!
Because all inputs have frame synchronisers, a source cannot be set outside the source window; if
a source is delayed (shifted to the right) beyond the end of the window, the whole diagram moves
one frame to the right, so the source is now at the left hand edge of the window, and the input
synchroniser is inserting a frame of delay.
To minimise lip-sync problems, it is usually preferred to minimise the delay through a switcher. If
the OPT card is fitted, the desired
Border Gen Delay must be set in the Configure-System-
System Delays sub-menu, before making timing adjustments since it affects the processing delay.
Refer to the User Manual.
For example if the Border Gen Delay is set to 10 lines, the processing delay will be 10 lines +
33us. If the sources are set 11 lines in advance of the output, this will allow for the processing
delay. The sources will be at the right hand end of the source window in the diagram, and the
delay through the input synchronisers will be 64 - 33 = 31us. If the switcher and sources are locked
to a common reference (method (a) above), set the
Genlock V Phase to 11 to achieve this. If the
sources are genlocked to the Ref Sync Out put of the switcher (method (b) above), set the Sync
V-Phase control to 11 lines advance: 625 - 11 = 614 in 625-line standards or 525 - 11 = 514 in 525-
line standards. If the DVE option is fitted the delay will now be 1 frame +11 lines. It can be
reduced to 11 lines for paths which do not pass through a DVE by setting the
DVE Delay in the
Configure-System-System Delays sub-menu to minimum; in this case there will be a time jump
when a DVE is selected or de-selected.
Outputs
Connect the four outputs Program , Clean Pgm , Preview 1, & Preview 2 to external equipment or
monitoring devices as desired.
Program This is the main program output.
Clean Pgm This is the main program output before the DSK stage.
Preview 1 Preview 1 can be switched between any source, a number of mixing points in the
system and transition previews.
Preview 2 Preview 2 is a second preview output with similar capabilities to the first, except that
it cannot preview mixer transitions.
Two copies of each output are available.
The Preview 1 output is also available in Analogue Component, as either YPbPr or RGB. Whether
YPbPr or RGB format is used can be selected in the Configure - System - Genlock & Outputs
menu. The R, G, B and Y outputs have syncs. If the monitor requires separate syncs, the Ref
Sync Out put can be used if it is not required for system referencing.