L LINE 1650 SAMPLES (0-1649) Figure 7.3-28 General 720p Analog-Digital Relationship. Figure 7.3-27 720p Analog-Digital Relationship (16:9 Aspect Ratio, 59.94 Hz Frame Rate, 74.176 MHz Sample Clock and 60 Hz Frame Rate, 74.25 MHz Sample Clock). Table 7.3-1 Various 720p analog-digital parameters for Figure 7.3-28. Active horizontal Frame rate (Hz) 1 X Y Sample Total horizontal Horizontal blanking C samples samples rate (MHz) samples (A) samples (B) 24/1.001 74.25/1.001 74.25 74.25 30/1.001 74.25/1.001 74.25 74.25 60/1.001 74.25/1.001 74.25 Note: 1. Useful for CRT-based 50 Hz HDTVs based on a 31.250 kHz horizontal frequency. Sync pulses are - 300 mV bi-level, rather than +300 / tri-level. 720p content scaled vertically to 1152i active scan lines; 1250i total scan lines instead of 750p. LINE 1 (V = 1) BLANKING LINE 26 (V = 0) NUMBER ACTIVE VIDEO 26-745 746-750 LINE 746 (V = 1) BLANKING LINE 750 (V = 1) Figure 7.3-29 720p Digital Vertical Timing (720 Active Lines). V changes state at the EAV sequence at the beginning of the digital line. Note that the digital line number changes state prior to the start of horizontal sync, as shown in Figures 7.3-27 and 7.3-28. Video signals overview CHAPTER 7.3 START VSYNC Figure 7.3-30 1080i Vertical Interval Timing. (750p50 with VBI) and 1080i25 (1125i25 with VBI) time is about 14.83 us. Detailed horizontal timing is analog signals. dependent on the specific video interface used. The set-top box or DVD player converts 720p50 and 1080i25 content to the 1152i25 format. 1280 X 720p50 Interlaced digital component video content is scaled to 1280 X 1152i25; 1920 X 1080i25 content is presented letterboxed in a 1920 X 1152i25 ITU-R BT.709 and SMPTE 274M specify the digital format. HDTVs will have a nominal vertical zoom component format for the 1080i digital R'G'B' or YCbCr mode for correcting the geometry of 1080i25, which can signal. Active resolutions defined within BT.709 and be recognized by the vertical synchronizing signal. SMPTE 274M, their 1x Y and R'G'B' sample rates (Fs), and fr