High-definition television
High-definition television (or HDTV) is a digital TV system with a higher resolution than traditional television systems (standard-definition television or SDTV). HDTV digital broadcast, the first implementations used in analog broadcasting, but now the digital television (DTV) are the signals that have less bandwidth, since the digital video requires compression.
History of high-definition television
More information: Analog System-High Definition Television
The term high definition once described a series of television systems from the end of 1930, but these systems are in high definition only in comparison to previous systems based on the mechanical systems, with a minimum of 30 lines of resolution.
The British high-definition TV service started trials in August 1936 and regular service in November 1936 with two l '(mechanical) and 240-line Baird (e) Marconi-EMI Line 405 (377) systems. The Baird system was discontinued in February 1937. In 1938, France followed with their system of 441 lines, which variants are used by a number of other countries. The American system NTSC occurred in 1941. In 1949, France introduced a higher resolution to 819 lines (768.), a definition that is high even by today's standards, but it was in black and white. All these systems use interlacing and aspect ratio of 4:3, with the exception of a line was the 240 progressive (in fact, described the moment with the technically correct term "sequential") and the system of 405 lines, which started as a 5: 4, and then changed to 4:3. The system of 405 lines has had the (then) revolutionary idea of the interlaced scanning, the problem of flicker from the track at a speed of 240 Hz Figure 25 to be overcome. 240 The online system could have doubled his pace, but it would mean that the transmitted signal bandwidth, one option would be unacceptable doubled.
Began broadcasting in color at resolutions even higher, first with the NTSC color system in the United States in 1953, which is compatible with older systems from B & W, and then the same lines, 525 (480i) resolution had. The European standards are not until 1960, held when the PAL and SECAM color systems for black and white 625 lines (576i) transfers have been added.
After the formal adoption of the Digital Video Broadcasting (DVB),
LED 1080p HDTV transmission mode on the big screen in the spring of 2000, the line 525 (NTSC and PAL-M systems), and the European Network for the 625-line PAL and SECAM are currently available as the standard-definition TV systems. In Australia, the 625-line digital progressive system (with 576 active lines) is officially recognized as a high-definition.
High-definition display resolutions
Native resolution (W×H) Video format supported 720p 1280×720
Native resolution (W×H) 1024×768 XGA , Actual 786,432 , Advertised (Mpixel) 0.8 ,Aspect ratio (W:H) Image 16:9 , Pixel 4:3
Description Typically a PC resolution (XGA), and also a native resolution on the entry of plasma levels of many non-square pixels.
Native resolution (W×H) 1280×720 XGA , Actual 921,600 , Advertised (Mpixel) 0.9 ,Aspect ratio (W:H) Image 16:9 , Pixel 1:1
Description Standard resolutions and
HDTV resolution typical PC (XGA), often from video projectors used for the 750-line video, as in SMPTE 296M, ATSC A/53, ITU-R defines BT.1543.
Native resolution (W×H) 1366×768 WXGA , Actual 1,049,088 , Advertised (Mpixel) 1.0 ,Aspect ratio (W:H) Image 683:384 (approx. 16:9) , Pixel 1:1 approx.
Description A typical PC resolutions (XGA), even from many screens to HD-Ready LCD technology uses.
Video format supported 1080p/1080i 1920×1080
Native resolution (W×H) 1920×1080 XGA , Actual 2,073,600 , Advertised (Mpixel) 2.1 ,Aspect ratio (W:H) Image 16:9 , Pixel 1:1
Description Resolution HDTV standard, with
LED 1080p HDTV and HD ready 1080p TV uses shows how high-end LCD, plasma and projection TVs, PCs, and a typical resolution (WUXGA below), and for 1125 using online video as defined in SMPTE 274M, ATSC A/53, ITU-R BT.709;
Video Format Supported 720p.
Screen resolution (W×H) 1280 × 720 1248 × 702
Clean Aperture ,Pixels Actual 876,096 , Pixels Advertised (Mpixel) 0.9 , Aspect ratio (W:H) Image 16:9 Pixel 1:1
Description chance for 750-line video with raster artifact / overscan compensation, as defined in SMPTE 296M.
Video Format Supported 1080p.
Screen resolution (W×H) 1920 × 1080 1888 × 1062
Clean Opening ,Pixels Actual 2,001,280 , Pixels Advertised (Mpixel) 2.0 , Aspect ratio (W:H) Image 16:9 Pixel 1:1
Description video line for 1125 with the fastest artifact / overscan compensation, as defined in the SMPTE 274M.
Video Format Supported 1080i.
Screen resolution (W×H) 1920 × 1080 1440 × 1080
HDCAM / HDV ,Pixels Actual 1,555,200 , Pixels Advertised (Mpixel) 1.6 , Aspect ratio (W:H) Image 16:9 Pixel 1.3:1
Description Used for anamorphic 1125-line video in HDV and HDCAM, Sony will be introduced and defined (also known as sub-sampling of luminance matrix) in SMPTE D11.
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