High Definition TV: a television system with approximately twice the horizontal and twice the vertical resolution of current 525-line and 625-line systems, component colour coding (e.g. RGB or YCbCr) a picture aspect ratio of 16:9 and a frame rate of at least 24 Hz. The principal scanning formats have active vertical scanning lines of 720 progressive (720p), 1080 interlaced (1080i). Though 1080i as higher resolution than 720p, it doesn’t render motion quite as well the progressive scanning format.
