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A key difference between 1080i and 1080p is how the lines of resolution are displayed. Both offer 1920x1080 pixels, but the display method is different. In 1080p, the "p" stands for progressive scan. Each frame is drawn line by line, from top to bottom, creating a complete image in a single pass.
When the overall interlaced framerate is 60 frames per second, a pixel (or more critically for e.g. windowing systems or underlined text, a horizontal line) that spans only one scanline in height is visible for the 1/60 of a second that would be expected of a 60 Hz progressive display - but is then followed by 1/60 of a second of darkness ...
On August 27, 2007, URSEC settled on DVB-T and DVB-H. The TV sets being sold in Uruguay seem to be closer to ATSC HDTV-based standards (60 Hz systems, with ATSC tuners in some cases). Most of the DVD-based content in the country is NTSC/60 Hz-based, while the TV standard in use is PAL/50 Hz-based.
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To convert 24 frame/s film to 29.97 frame/s (presented as 59.94 interlaced fields per second) NTSC, a process called "3:2 pulldown" is used, in which every other film frame is duplicated across an additional interlaced field to achieve a framerate of 23.976 (the audio is slowed imperceptibly from the 24 frame/s source to match). This produces ...
2:2 pulldown is widely used in 50 Hz interlaced television systems to broadcast progressive material recorded at 25 frame/s, but is rarely used in 60 Hz systems. The 2:2 pulldown scheme had originally been designed for interlaced displays, so fine vertical details are usually filtered out to minimize interline twitter. PsF has been designed for ...
The 576 identifies a vertical resolution of 576 lines, and the i identifies it as an interlaced resolution. [1] The field rate , which is 50 Hz , is sometimes included when identifying the video mode, i.e. 576i50 ; another notation, endorsed by both the International Telecommunication Union in BT.601 [ 2 ] and SMPTE in SMPTE 259M , includes the ...
Another difference between 50 Hz and 60 Hz standards is the way motion pictures (film sources as opposed to video camera sources) are transferred or presented. 35 mm film is typically shot at 24 frames per second (fps). For PAL 50 Hz this allows film sources to be easily transferred by accelerating the film by 4%.