Digital TV system format
What is D1? We all think that D1 is the hard disk video recorder display, video, playback resolution, in fact not, D1 is the digital TV system display format standard, divided into the following five specifications:
D1: 480i format (525i): 720 × 576 (480?) (Horizontal 480 lines, interlaced), and NTSC analog TV with the same clarity, 525 vertical scan lines, 483 visible vertical scan lines, 4: 3 or 16 : 9, interlaced / 60Hz, line frequency is 15.25KHz, equivalent to what we call 4CIF (704 × 576)
D2: 480P format (525p): 720 × 576 (480?) (Horizontal 480 lines, progressive scan), more detailed than the D1 interlaced scan, and progressive scan DVD specifications the same, 525 vertical scan lines, 480 Visible vertical scan line, 4: 3 or 16: 9, a resolution of 640 × 480 (?), Progressive / 60Hz, line frequency of 31.5KHz.
D3: 1080i format (1125i): 1920 × 1080 (horizontal 1080 line, interlaced), is the standard digital TV display mode, 1125 vertical scan lines, 1080 visible vertical scan line, 16: 9, resolution 1920 × 1080 , Interlaced / 60Hz, line frequency is 33.75KHz.
D4: 720p format (750p): 1280 × 720 (horizontal 720 lines, progressive scan), is the standard digital TV display mode, 750 vertical scanning lines, 720 visible vertical scanning lines, 16: 9, resolution 1280 × 720, progressive / 60Hz, line frequency is 45KHz.
Although the resolution is lower than D3, but because of progressive scan, the market more people feel relative to 1080I (the actual succession 540 lines) visual effects more clearly, but personally feel that the maximum resolution of 1920 × 1080 situation , D3 is more clear than the D4 feel, especially the text expression, the resolution of 1280 × 720p / 60Hz, the line frequency is 45kHz
D5: 1080p format (1125p): 1920 × 1080 (horizontal 1080 line, progressive scan), the current civil high-definition video the highest standard, resolution of 1920 × 1080P / 60Hz, line frequency is 67.5KHZ. Is the standard digital TV display mode , 1125 vertical scan lines, 1080 visible vertical scan lines, 16: 9, professional format. 60HZ is only ideal field frequency, and its line frequency is 67.5KHZ, in the field of expertise 1080P field frequency is only 24HZ, 25HZ and 30HZ. The film is 24 per second way to play the film. Digital images taken in 1080p / 24Hz mode can be transmitted to the digital cinema projectors such as DLP / D-ILA without loss, and are played in movie format. 1080p / 24Hz is a format for movies. If you use 1080p / 25Hz format to capture high-definition content, you can easily complete each frame 1080p image into two lines of interlaced 1080i images. So 1080p / 25Hz format becomes 1080i / 50Hz images, easy to apply to Europe and China, the original PAL system of digital high-definition television. Similarly, 1080p / 30Hz can also be easily converted to 1080i / 60Hz images after shooting, easy to use in the United States ATS and Japan ISDB and other original NTSC system analog TV country.
Which D1 and D2 standard is our general analog TV the highest standards, and can not be called on the high-definition, D3 1080i standard is the basic standard of high-definition TV, it can be compatible with 720p format, it should be noted that the D terminal is Japan Unique special interface, the domestic TV fresh belt this interface, the most is the color interface, and the color interface to support up to D4, theoretically there is no HDMI (pure digital signal, support to 1080P) the highest clarity, but In 1920: 1080 the following resolution of the TV, the general is not very different.
1080P, is able to display 1920 * 1080 program, but the TV itself does not have 1920 * 1080 physical resolution, but the 1920 * 1080 image after processing down to the actual physical resolution of the TV, the show. 32-inch LCD TV physical resolution of 1366 * 768, but the instructions may be marked on the 1080P, is to 1920 * 1080 images processed into 1366 * 768 show. The 1080P is the highest resolution or display resolution, only on behalf of the TV can receive 1920 * 1080 signal, but the display is not 1920 * 1080.
FULL HD is able to fully display 1920 * 1080 pixels or physical resolution of 1920 * 1080 flat panel TV. If you watch HDTV programs, you need to use FULL HD TV for the best results. It should be noted that, FULL HD and many previous manufacturers to promote the 1080P is not the same concept.