Basics of Video 3.4.
Digital video is represented as a sequence of digital images.
Some interference between the two signals is inevitable. It uses two lines, one for luminance and another for composite chrominance signal. Subsampled in both the horizontal and vertical axes by a factor of 2 between pixels as shown in the figure. To play on existing TVs, PAL systems need to do frame rate conversion, and NTSC systems need to do line-number conversion. The ATSC Digital Television Standard was recommended to be adopted as the Advanced TV broadcasting standard by the FCC Advisory Committee on Advanced Television Service on November 28, 1995.