Miranda Camera Co JAZZ-800 manual Frame Synchronizing

GUIDE TO INSTALLATION AND OPERATION

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.

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