The Enhanced Definition TV (abbreviated as EDTV by AbbreviationFinder) defines formats that provide higher image TV Standard Definition SDTV not as detailed as the television of high definition HDTV. Refers to devices capable of displaying 480 or 576 line progressive scan signals, commonly referred to as 480p NTSC-HQ and 576p PAL respectively, as opposed to interlaced scan, commonly referred to as 480i NTSC or 576i PAL. This television format arose to solve the deficiencies of standard television or SDTV, visible above all on modern large-size televisions.
History
From the 1960s until a few years ago, the only television format has been SDTV, since in all this time, the limitations of the electronics of television sets, together with the short diagonal length of their screens (21 to 25 inches at most) did not require higher performance systems: between 480 and 576 horizontal lines (depending on the format).
The generalization of increasingly large screens and the appearance of digital systems, evidenced the limitations of analog TV and an image that on a 14-inch device looked correct, showed serious deficiencies in another of 30, with an area more than four times higher. These deficiencies were shown in the form of blinking the image and the feeling of observing a blurry and unstable image due to the low resolution of the signal and that large televisions force to view the image from closer. The above limitations incentivized manufacturers to design and manufacture systems that expanded the capabilities of SDTV, and the first of these systems was EDTV.
Fundamental characteristics
EDTV incorporates the elimination of interlacing in the image scan. This significantly improves quality by eliminating the spatial and temporal aliasing associated with SDTV systems. It is also the main reason why the quality of EDTV is clearly superior to SDTV.
Its main characteristics are:
- 480p or 576p resolution
- 4: 3 or 16: 9 aspect ratio
- 50 or 60 images per second
EDTV is an important step forward in display technology, establishing a much more elegant picture than interlaced television. The deinterlacer not only assembles the frame, but also cleans up any artifacts in the process. Additionally, EDTV can paint an entire frame in 1 / 60th of a second, allowing you to paint the same frame twice. This creates a cleaner and more stable image. It also exhibits a 16: 9 aspect ratio, which means that the screen is rectangular or theater-shaped. In conclusion, EDTV can play high definition or HDTV broadcasts, while SDTV can not.
It is considered suitable especially for screens measuring less than 20 or 25 inches in diagonal, since from these sizes, especially if you want to look at the screen closely, it is necessary to use the HDTV format (720p or 1080i / p).
Advantage
- Enhanced definition television
- Technique to improve the quality of the television image
- It consists of converting an interlaced font into progressive
- Prevents flickering of edges and lines caused by interlacing
- It requires consoles that convert the format and televisions that allow its progressive deployment
- The most common application is with advanced DVD players
EDTV in Videogames
The video resolution of video game consoles reached EDTV specifications as of the Sega Dreamcast, becoming the first mainstream console with a VGA output, compatible with EDTV. The PlayStation 2, Nintendo GameCube, Microsoft Xbox and Wii are also EDTV compatible with a component connection. The Xbox 360 can output 480p output through YP BPR, VGA, and HDMI component cables (newer models only). The PlayStation 3 broadcasts EDTV through its HDMI and component video (YP BPR) connections; 480p is only available on NTSC consoles, while 576p is only available on PAL consoles.
Present
This system is currently the most widespread, used in DVD, DTT, satellite TV, miniDV cameras or game consoles and has relegated SDTV to analog broadcasts. To work with a resolution of 720 x 480 progressive format and have this quality, you need to send the player apparatus television a progressive signal and the television also is able to work in this format.
EDTV is currently the most widely used system, especially in Europe, despite being also the most unknown, mainly due to the fact that it is often confused with SDTV and that audiovisual systems manufacturers are encouraging the market to do the same. step to HDTV as it is detached from all SDTV and EDTV systems, which make up the majority of devices installed today. Except for analog television, all current systems work with EDTV, it is to be expected that it will not change too much in the coming years, since despite the fact that systems have been extended since 2007 HDTV and HD DVD and Blu-ray and there is also on the market video game consoles new generation that generate images HDTV, other systems, such as televisions, TDT and television by satellite, still take a few years to move to HDTV. This delay is due to the large number of SDTV and EDTV equipment installed, especially the latter have been acquired in the last 3 or 4 years, if one takes into account that for screen diagonals less than 30 inches (the vast majority) the difference in quality between an EDTV system and a HDTV is difficult to view due to the limitations of the human visual system.
