74.250 MHz 25.00 Hz Progressive analog component video 1920 X 1080i 74.176 MHz 29.97 Hz Analog component signals are comprised of three 1920 X 1080i 74.250 MHz 30.00 Hz signals, analog R'G'B' or YPbPr. Referred to as 1080p (since there are typically 1080 active scan lines per Note that square pixels and a 16:9 aspect ratio are frame and they are progressive), the frame rate is used. Other common active resolutions, their 1 X Y and usually 50 or 59.94 Hz (60/1.001) to simplify the R'G'B' sample rates (Fs), and frame rates, are: generation of (B, D, G, H, I) PAL or (M) NTSC video. The analog interface uses 1125 lines per frame, with 1280 X 1080i 49.500 MHz 25.00 Hz active video present on lines 42-1121, as shown in 1280 X 1080i 49.451 MHz 29.97 Hz Figure 7.3-31. MPEG-2 and MPEG-4 systems use 1088 lines, rather 1280 X 1080i 49.500 MHz 30.00 Hz than 1080, in order to have a multiple of 16 scan lines per 1080i 55.688 MHz 25.00 Hz frame. In this case, an additional 8 lines per frame after the active video are used. 1080i 55.632 MHz 29.97 Hz For the 50 Hz frame rate, each scan line time is about 1080i 55.688 MHz 30.00 Hz 17.78 us. For the 59.94 Hz frame rate, each scan line START VSYNC Figure 7.3-31 1080p Vertical Interval Timing. CHAPTER 7.3 Video signals overview SAMPLE RATE = 74.25 OR 74.176 MHZ [D] SAMPLES 88 SAMPLES DIGITAL BLANKING DIGITAL ACTIVE LINE DIGITAL [C] SAMPLES [A] SAMPLES BLANKING DIGITAL ACTIVE LINE 280 SAMPLES 1920 SAMPLES TOTAL LINE (0-279) (280-2199) [B] SAMPLES TOTAL LINE 2200 SAMPLES (0-2199) Figure 7.3-33 General 1080i Analog-Digital Relationship. Figure 7.3-32 1080i Analog-Digital Relationship (16:9 Aspect Ratio, 29.97 Hz Frame Rate, 74.176 MHz Sample Clock and 30 and SMPTE 274M, their 1x Y and R'G'B' sample rates Hz Frame Rate, 74.25 MHz Sample Clock). (Fs), and frame rates, are: 1920 X 1080p 74.176 MHz 23.976 Hz Example relationships between the analog and digital signals are shown in Figures 7.3-32 and 7.3-33, and Table 1920 X 1080p 74.250 MHz 24.000 Hz 7.3-2. The H (horizontal blanking) and 