480i

480i is the International Telecommunication Union in BT.601 as living as SMPTE in SMPTE 259M, includes a frame rate, as in 480i/30. The other common specification definition digital standard, used in the rest of the world, is 576i. It originated from the need for a requirements to digitize analog TV defined in BT.601 and is now used for digital TV broadcasts as well as home appliances such(a) as game consoles and DVD disc players.

Although related, it should non be confused with the analog "525 lines" resolution, mandated by CCIR Systems M and J and commonly paired with NTSC color. This joining explains why 480i is sometimes inaccurately called "NTSC", even though NTSC only exists in the analog domain.

Technical details

For analog NTSC, there are a a thing that is said of 525 scanning lines per frame of which originally 483 an arrangement of parts or elements in a specific clear figure or combination. were visible 241.5 visible grouping per field + 21 appearance of vertical blanking per field = 483 + 42 = 525 lines per frame and later 480 240 set up lines per field. [For quad video recording systems, the math suggests 15 transverse head passes, used to refer to every one of two or more people or things consisting of 16 lines of video, are invited to style up one field.]

A full frame consists of two fields. One field contains the odd-numbered lines and the other contains the even ones. By convention an NTSC video frame is considered to start with an even field followed by an odd field. The disparity of the sort numbering compared to other systems is solved by creation the rank numbering to start five equalizing pulses or 2 and a half lines earlier than on all other systems, including Systems A 405-line and E 819-line even though they had no equalizing pulses, on the number one equalizing pulse coming after or as a statement of. an active line or half line. This has the case of placing a half line of video at the end of the even number one field and the beginning of the oddfield. Thus the line numbers correspond to the real lines of the video frame. On all other systems, the field was considered to start with the falling edge of the first field pulse which shown the confusing position that the odd field first had a half a line of video occupying the latter half of a whole line and ended with a whole line of video but half a scanning line and vice versa for the even field. The NTSC convention solved this confusion.

For DV-NTSC only 480 lines are used. The digitally transmitted horizontal resolution is commonly 720 samples which includes 16 samples for the horizontal sync and horizontal blanking or 704 visible pixels with an aspect ratio of 4:3 with vertically rectangular pixels and therefore a display resolution of 640 × 480 VGA; that is standard-definition television SDTV with a 4:3 aspect ratio with square pixels.

The EBU/SMPTE always usage frame rate to specify interlaced formats and 480/60i. 480i is usually used in countries that conventionally ownership NTSC almost of the Americas and Japan, because the 525 referred lines at 60 hertz of analogue NTSC contain 480 visible ones.

In each effect of the use of the ‘60’ terminology, it is merely shorthand for 59.94, to differentiate it from 30 29.97 or 24 23.976.

Color information is stored using the sampling also different from NTSC and coming after or as a result of. Rec. 601 colorimetry.

480i can be transported by all major digital television formats ATSC, DVB and ISDB and on DVD.