Grass Valley Zodiak Installation Planning Guide - Manual (Page 31)

Zodiak Installation Planning Guide 31
Zodiak Video Timing and Delay
Zodiak Video Timing and Delay
The total delay of a video input to the switcher output can vary according
to the relationship of the input to the switcher reference. The switcher will
automatically autotime inputs by a specified amount (± B µs). Inputs must
be within this timing range to be properly timed at the output. A timing
diagram for illustrating the input autotiming window and various
switcher delay values is provided in
Figure 37 .
Figure 37. Switcher Timing Diagram
Note For both 525 and 625 switcher operation, the approximate maximum
switcher delay is one line of video.
• For inputs entering the switcher in zero time with the reference, the
total delay through the switcher is expressed as the Nominal Switcher
Delay (A µs).
• Inputs that reach the switcher at the latest point in the autotiming
window (+ B µs) will have a total delay that equals the length of
switcher processing. This value is expressed as the Minimum Switcher
Delay (C µs).
• Inputs that reach the switcher at the earliest point in the autotiming
window will have a total delay equal to the Nominal Switcher Delay (A
µs) plus the autotiming value (– B µs). This value is expressed by the
Maximum Switcher Delay value (D µs).
Delay values for a Zodiak system are given in Table 6 .
Table 6. Zodiak System Video Delay Values
Nominal Switcher Delay A 49 µs
Serial Input Autotiming Delay B ± 14 µs
Minimum Switcher Delay C 35 µs
Maximum Switcher Delay D 63 µs
Nominal Output
Timing
Serial Input
Autotiming
Window
+/- B µs
Nominal Reference
Timing
8096_03_05_r1
Nominal Switcher Delay
A µs
Maximum Switcher Delay
D µs
Minimum Switcher Delay
C µs
- B µs + B µs 0 µs