Grass Valley K-Frame Installation Planning Guide Jul 07 2014 - Manual (Page 41)

K-FRAME — Installation Planning Guide 41
K-Frame System Video Timing and Delay
Alternatively, any one of the K-Frame video inputs can also be used as ref-
erence in the respective standard.
K-Frame System 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 that fall within an autotiming window.
Inputs must be within this range to be properly timed at the output. The
calculation of the actual video delay of a specific input is the Nominal
Switcher Delay minus the input time location within the autotiming
window (the time location value can be zero, positive, or negative). A
timing diagram of the input autotiming window and various switcher
delay values is provided in
Figure 3 .
Figure 3. Switcher Timing Diagram
• For inputs entering the switcher in zero time with the reference, the
total delay through the switcher is 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 time required for
switcher processing. This value is the Minimum Switcher Delay (C μs).
• Inputs that reach the switcher at the earliest point in the autotiming
window (-B μs) will have a total delay equal to the Nominal Switcher
Delay (A μs) plus the autotiming window range. This value is the
Maximum Switcher Delay value (D μs).
On K-Frame systems the autotiming window varies depending on the
operating mode. The Timing Analyzer in the Video Settings Menu displays
this autotiming information.
Note The maximum switcher delay is approximately one line of video.
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