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Digital Video and HD, 2nd Edition by Charles Poynton

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39

480i component video

This chapter details the scanning, timing, sync structure, and picture structure of 480i29.97 (525/59.94/2:1) video. The scanning and timing information in this chapter applies to all variants of 480i video, both analog and digital. The sync information relates to component analog, composite analog, and composite digital systems.

Frame rate

480i video represents stationary or moving two-dimensional images sampled temporally at a constant rate of 30/1.001 frames per second. For studio video, the tolerance on frame rate is normally ±10 ppm. In practice the tolerance applies to a master clock at a high frequency, but for purposes of computation and standards writing, it is convenient to reference the tolerance to the frame ...

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