What is the meaning of 480P, 720P, 1080P in HD video?

Often go to the forum to download movies, see the title is marked with 480P, 720P words, I do not know if they do not understand what they mean? Today, what is the meaning of 480P, 720P, 1080P in this HD video?

In fact, this is the format of high-definition video. We download HD video source from the Internet. When playing, we need to use high-definition equipment, such as HDTV. When you put it on your computer, you need HD monitor and HD graphics card. When you buy a laptop, you can pay attention to the parameters of the display and the graphics card. The HD in front is HD. Off topic, the following is the topic.

The so-called HDTV, also known as "HDTV", is a high definition television standard format determined by the American Society of Motion Picture and Television Engineers. Generally speaking, HD is the most high-definition TV. The clarity of a television is measured by the number of horizontal scanning lines. Here are a few common TV scan formats:

D1 is 480i format, the same as NTSC analog TV, 525 vertical scan lines, 480 visible vertical scan lines, 4:3 or 16:9, Interlaced /60Hz, line frequency is 15.25KHz;

D2 is 480P format, same as progressive scan DVD, 525 vertical scan lines, 480 visible vertical scan lines, 4:3 or 16:9, The resolution is 640× 480, progressive/60Hz, and the horizontal frequency is 31.5KHz;

D3 is 1080i format, which is the standard digital TV display mode, 1125 vertical scanning lines, 1080 visible vertical scanning lines, 16 :9, resolution is 1920 & times; 1080, interlaced /60Hz, line frequency is 33.75KHz;

D4 is 720p format, is standard digital TV display mode, 750 vertical scanning lines, 720 visible vertical scanning lines , 16:9, resolution is 1280× 720, progressive/60Hz, line frequency is 45KHz;

D5 is 1080p format, is standard digital TV display mode, 1125 vertical scanning lines, 1080 visible vertical Scan line, 16:9, resolution is 1920× 1080 progressive scan, professional format;

There is also a 576i, a standard PAL TV display mode, 625 vertical scan lines, 576 visible vertical scan lines, 4:3 or 16:9, interlaced /50Hz, recorded as 576i or 625i.

HDTV is the TV standard that supports 1080i, 720P and 1080P. Today's large-screen LCD TVs generally support 1080i and 720P, and some commonly known "Full HD" (Full HD) refers to TVs that support 1080P output. The current high-definition TV digital signal, up to 720P, so if you go to buy HD TV, if the business flickers you 1080P output, then you should consider whether it is worth buying, of course, if you have money, then I did not say.