Active line

The part of a television line that carries picture information. The remainder of the whole line time is mainly reserved to allow scans to reset to the start of the next line in camera tubes and CRT screens. Although the imaging and display technologies have moved on to chips and panels, there remains a break (line blanking) in the sampling of digital TV as in ITU-R BT.601 and ITU-R BT 709. These ‘spaces’ carry data for the start of lines and pictures, as well as other information such as embedded audio tracks.

See also: Active picture