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Digital Video and HD, 2nd Edition by Charles Poynton

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41

280 ×720 HD

This chapter details the scanning, timing, and sync structure of 1280 ×720 video, also called 720 p. The scanning and timing information in this chapter applies to all variants of 720 p video, both analog and digital.

SMPTE ST 296, 1280 × 720 Progressive Image Sample Structure – Analog and Digital Representation and Analog Interface.

Scanning

720p video represents stationary or moving two-dimensional images sampled temporally at a constant rate of 24/1.001, 24, 25, 30/1.001, 30, 50, 60/1.001, or 60 frames per second. The sampling rate is 74.25 MHz (modified by the ratio 1000/1001 in 720 p59.94, 720p29.97, and 720 p23.976). All of these systems have 750 total lines (L T). The number of samples per total line (S TL) is adapted to ...

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