Zodiak Installation and Service Manual
77
Zodiak Control Surface Cabling and Control
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 50. 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 14. 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
µ
s
Nominal Reference
Timing
8096_03_05_r1
Nominal Switcher Delay
A
µ
s
Maximum Switcher Delay
D
µ
s
Minimum Switcher Delay
C
µ
s
- B
µ
s
+ B
µ
s
0
µ
s
