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480p
480p is the shorthand name for a family of video display resolutions. The ''p'' stands for progressive scan, i.e. non-interlaced. The ''480'' denotes a vertical resolution of 480 pixel high vertically scanning lines, usually with a horizontal resolution of 640 pixels and 4:3 aspect ratio (480 × = 640) or a horizontal resolution of less than 854 (848 should be used for (mod16 ) compatibility) pixels for an approximate 16:9 aspect ratio (480 × = 853.3). Since a pixel count must be a whole number, in Wide VGA displays it is generally rounded up to 854 to ensure inclusion of the entire image. The frames are displayed progressively as opposed to interlaced. 480p was used for many early Plasma televisions.〔(afterdawn.com - 480p )〕〔CNET - (Glossary - 480p )〕 Standard definition has always been a 4:3 aspect ratio with a pixel resolution of 640 × 480 pixels. Mini-DV, DVCAM, DV footage is recorded at 29.97 frames per second in this standard definition as seen on DV tapes.
480p does not qualify as high-definition television (HDTV); it is considered enhanced-definition television (EDTV).
==480p24 and 480p30==
The ATSC digital television standards define 480p with either 704 × 480 (BT.601 line sampling) or 640 × 480 (unscaled line sampling) pixel resolutions, at 24, 30, or 60 progressive frames per second.
Both 480p24 and 480p30 are more common in countries that use or have used the interlaced NTSC system like North America and Japan (these formats are somewhat compatible with that system, when used to broadcast progressive film content).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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