Method of scanning all the lines of a picture (1 image = 1 frame = 1 field). E.g. for a computer working in SVGA at 800 x 600 lines, it gives 600 lines per frame. For some HDTV formats, the scanning method is the same but is called "progressive".
National Association Broadcaster.
National Systems Contractors Association.
National Television Standard Committee. Television standard used in North America, Japan and other parts of the world (South America and Asia). NTSC has 525 horizontal and interlaced lines refreshed at 60 fields per second. The Chrominance subcarrier is of 3.58 MHz (sometimes 4.43 MHz). See also FRAME RATE.
Measurement of resistance (named after Georg Simon Ohm), shown by the ½ symbol. 75 Ohms is the standard load for an RGB video signal.
On Screen Display.
see S.Video connector.
Action of cutting and mixing 2 or more video pictures onto the same display.
Opposite of UNDERSCAN. In Overscan mode, to avoid seeing the corners and the borders, the image is displayed about 8% bigger than in standard (Underscan) mode. Standard TV display mode is Overscan.
Phase Alternate Line. Television standard used in Western Europe, Australia, Britain and South Africa. A PAL picture is composed of 625 horizontal, interlaced lines refreshed at 50 fields per second. The Chrominance subcarrier is of 4.43 MHz.
Brazilian version of the PAL standard composed of 525 horizontal, interlaced lines refreshed at 60 fields per second. The Chrominance subcarrier is of 4.43 MHz.
Device which generates known reference pictures, enabling adjustments to be made.
Time taken by a periodic signal to execute a cycle. See Frequency.
Audio pin screw terminals, see MCO.
Picture in Picture.
Distance that separates 2 pixels in a display.
Abbreviation for picture element. A pixel is the smallest element (Black and White or Color) that makes up an image. Pixels make up lines and columns and define the resolution of the picture. E.g. XGA = 1024 x 768 = 1024 pixels x 768 lines = 786432 pixels per image.
Positive or Negative sign of a signal.
Method for transfering Film Image (24/sec) to video (30/sec) in USA & Japan. Image sequence is 2/3/2/3 with 2+3=5 Fields redundancy.