ing frequencies of Y, Cb and Cr were 4x, 2x, (M) NTSC and (M) PAL are analog composite video and 2x 3.375 MHz, respectively. "4:2:2" now commonly signals that carry all timing and color information within means that the sample rate of Cb and Cr is one-half that a single signal. These analog interfaces use 525 lines per frame. of Y, regardless of the actual sample rates used. With 13.5 MHz sampling, each scan line contains 858 samples (480i systems) or 864 samples (576i systems) Interlaced analog component video and consists of a digital blanking interval followed by an active line period. Both the 480i and 576i systems use Analog component signals are comprised of three signals, 720 samples during the active line period. Having analog R'G'B' or YPbPr. Referred to as 480i (since there Video signals overview CHAPTER 7.3 START VSYNC HSYNC HSYNC 2 Figure 7.3-1 480i Vertical Interval Timing. START VSYNC Figure 7.3-2 480p Vertical Interval Timing. are typically 480 active scan lines per frame and they are interlaced), the frame rate is usually 29.97 Hz (30/1.001) for compatibility with (M) NTSC timing. The analog in- terface uses 525 lines per frame, with active video present SAMPLE RATE = 13.5 MHZ on lines 23-262 and 286-525, as shown in Figure 7.3-1. For the 29.97 Hz frame rate, each scan line time (H) is 16 SAMPLES about 63.556 us. Detailed horizontal timing is dependent on the specific video interface used. Progressive analog component video DIGITAL BLANKING DIGITAL ACTIVE LINE 138 SAMPLES 720 SAMPLES (0-137) (138-857) Analog component signals are comprised of three signals, analog R'G'B' or YPbPr. Referred to as 480p (since there TOTAL LINE are typically 480 active scan lines per frame and 858 SAMPLES they are progressive), the frame rate is usually 59.94 Hz (0-857) (60/1.001) for easier compatibility with (M) NTSC timing. The analog interface uses 525 lines per frame, Figure 7.3-3 480i Analog-Digital Relationship (4:3 Aspect Ratio, 29.97 Hz Frame Rate, 13.5 MHz Sample Clock). BT.601 specifies with active video pr