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GUIDE TO INSTALLATION AND OPERATION
JAZZ-800 | 7
Frame-rate conversions generally involve changing the number of lines and fields (or frames) per second in
an image. Examples of standards conversions include:
480i59.94 to 576i50
720p59.94 to 1080i50
1080i59.94 to 1080i50
If we look at a standards conversion from 480i59.94 to 576i50, we need to change two of the three
parameters of the signal. The first is the number of lines in each field. A 480i signal has 240 lines per field
while the 576i signal has 288 lines, as shown below.
The second parameter, which needs to be changed is the number of fields per second. The 480i signal has
59.94 fields per second while the 576i signal has 50, as shown below.
The third parameter, the number of pixels on each active picture line, does not change significantly between
480i and 576i.
Conversions involving high definition I/O require that all three domains must be changed. Examples include:
480i59.94 to 1080i50
1080i59.94 to 576i50
480i59.94 to 1080p23.98-sf
Frame Synchronizing
Frame Synchronization is the ability to propagate and lock a non-synchronous video signal throughout one’s
existing genlocked video system. The non-synchronous signal will be genlocked (timed or phased) and
“Framed Synch’d” in the vertical and horizontal domains to the house reference signal, usually a Black Burst
or HD Tri-Level sync signal.