Standard-definition television

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Standard-definition television (or SDTV) refers to television systems that have a resolution that meets standards but not considered either enhanced definition or high definition. The term is usually used in reference to digital television, in particular when broadcasting at the same (or similar) resolution as analog systems.

Standard definition television system is usually known as the 625-line system. Not all the lines are used for the picture though.

Only 576 lines are actually used for picture information. So a Standard Definition 625 line picture is 576 lines or pixels high. A standard definition digital picture is 702 pixels across, so the resolution of the picture is 702 x 576 pixels. There are the same numbers of pixels across the frame for both 4:3 and 16:9 images. HD is always 16:9.

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