480i
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480i is the shorthand name for a video mode. The i, which is sometimes uppercase, stands for interlaced, the 480 for a vertical frame resolution of 480 lines. The digitally transmitted horizontal resolution is usually 720 or 704 pixels with an aspect ratio of 4:3 and therefore a display resolution of 640 × 480; that is standard-definition television (SDTV).
The field rate (not the frame rate) is usually (60/1.001 ≈) 59.94 hertz for color TV and can be rounded up to 60 Hz. There are several conventions for written shorthands for the combination of resolution and rate: 480i60, 480i/60 (EBU) and 480/60i. 480i is usually used in traditionally NTSC countries (North America, Japan), because the 525 transmitted lines at 60 hertz of analogue NTSC contain 480 visible ones. 480i can be transported by all major digital television formats, ATSC, DVB and ISDB. NTSC DVDs use 480i when high motion is desired, but for movies 24 progressive frames per second (480p) are used instead. The 480i resolution is used in most standard definition TVs.
| Designation | Usage examples | Definition (lines) | Rate (Hz) | |
|---|---|---|---|---|
| Interlaced (fields) | Progressive (frames) | |||
| Low; MP@LL | LDTV, VCD | 240; 288 (SIF) | 24, 30; 25 | |
| Standard; MP@ML | SDTV, SVCD, DVD, DV | 480 (NTSC, PAL-M) | 60 | 24, 30 |
| 576 (PAL, SECAM) | 50 | 25 | ||
| Enhanced | EDTV | 480; 576 | 60; 50 | |
| High; MP@HL | HDTV, HD DVD, Blu-ray Disc, HDV | 720 | 24, 30, 60; 25, 50 | |
| 1080 | 50, 60 | 24, 30; 25 | ||
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| This table illustrates total horizontal and vertical pixel resolution via box size. It does not accurately reflect the screen shape (aspect ratio) of these formats, which is either 4:3 or 16:9. | ||||
[edit] See also
| edit Video formats |
|---|
| Defunct analog systems: 405 lines (1985) | 819 lines (1986) | PALplus (2004) |
| Defunct analog systems (cable, TVRO): PALplus (2004) | MUSE (2008) | MAC (2010s) |
| Analog terrestrial broadcast: NTSC | PAL | PAL-M (525 lines) | PAL-N (3.58 mhz colour) | SECAM |
| Digital (interlaced): SDTV 480i | SDTV 576i | HDTV 1080i |
| Digital progressive: LDTV 240p | LDTV 288p | EDTV 480p | EDTV 576p | HDTV 720p | HDTV 960p | HDTV 1080p |
| HDTV broadcast formats: ATSC | DVB | ISDB (ATSC & ISDB are part of the DVB standard) |
| Ultra High Definition TV (UHDV): Resolutions 2540p & 4320p; Audio 22.2 |
