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Because of its close association with the legacy colour encoding systems, it is often referred to as PAL, PAL/SECAM or SECAM when compared to its 60 Hz (typically, see PAL-M) NTSC-colour-encoded counterpart, 480i. The 576 identifies a vertical resolution of 576 lines, and the i identifies it as an interlaced resolution. [1]
The only lone exception was the PlayStation 2, where games ported over to PAL regions are oftentimes (but not always) running in 50 Hz modes. PAL region games supporting 60 Hz modes for the PlayStation 2 also requires a display with NTSC output unless RGB or component connections were used, since these allowed for colour outputs without the ...
This frame rate derives from the PAL television standard of 50i (or 50 interlaced fields per second). Film and television companies use this rate in 50 Hz regions for direct compatibility with television field and frame rates. Conversion for 60 Hz countries is enabled by doing 2:2:3:2:3 pulldown. [5]
NTSC-N was originally proposed in the 1960s to the CCIR as a 50 Hz broadcast method for System N countries Paraguay, Uruguay and Argentina before they chose PAL. In 1978, with the introduction of Apple II Europlus, it was effectively reintroduced as "NTSC 50", a pseudo-system combining 625-line video with 3.58 MHz NTSC color.
Television systems converters must avoid creating telecine judder effects during the conversion process. Avoiding this judder is economically importance, because much NTSC (60 Hz, technically 29.97 frame/s) resolution material that originates from film will have this problem when converted to PAL or SECAM (both 50 Hz, 25 frame/s).
The frame rate of 1080i is usually 50 or 60 Hz. It depends on the region. In areas using the PAL or SECAM standards, like Europe and parts of Asia, the frame rate is 50 Hz. In regions using NTSC, like North America and Japan, the frame rate is 60 Hz. The frame rate refers to how often a new field is shown per second.
[7] [8] [9] Thus producers had little choice but to run sets at 60 Hz in America, and 50 Hz in Europe. These rates formed the basis for the sets used today: 60 Hz System M (almost always used with NTSC color coding) and 50 Hz System B/G (almost always used with PAL or SECAM color coding). This accident of chance gave European sets higher ...
Typically, for 25 frame/s formats (European among other countries with 50 Hz mains supply), the content is PAL speedup, while a technique known as "3:2 pulldown" is used for 30 frame/s formats (North America among other countries with 60 Hz mains supply) to match the film frame rate to the video frame rate without speeding up the play back.
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