Details About Typical iptv premium Resolutions
iptv premium resolution is information about the number of picture elements (points or pixels) that make up TV picture. The higher the number the better and more sharper is the picture. In general there are two groups of television resolutions. The standard definition television (SDTV) as we know it for the last 50 years has few different standards that didn’t change since they were defined. The only “upgrade” was the addition of colors which did not modify anything related to the picture resolution. The high definition television (HDTV) means picture with more lines and picture elements. There are even higher resolutions (beyond HDTV) but the technology is still in infancy. Currently we are mainly talking about SD and HD television.
There are few different standards that were defined in the age of black and white television even before the World War II. Those standards define parameters like the number of lines, the number of pictures per second, and some other technical details. In general, the number of picture lines together with frequency bandwidth reserved for picture defines the television resolution. NTSC (the color television standard used in USA and Japan for SDTV) has resolution of 480 lines each with 720 pixels. In Europe and many other countries where PAL was used the resolution was 576 lines with 768 pixels in each line. Because this resolution was quite satisfactory and there was no easy way to enhance it, the old analog technology survived until recently when we started a transition to digital broadcasting.
Digital broadcasting allows us to use many advanced services and one of them is television picture with higher resolution–high definition television. HDTV means any TV resolution higher than SDTV. There are few standard resolutions that are supported by professional and commercial equipment. Each resolution has two modes: interlaced and progressive. Interlaced means alternatively displaying odd lines in one frame (still picture) and even lines in the next one, while progressive mode displays all lines in each frame. The basic HD resolution is 1280×720 which means displaying 720 lines with 1280 pixels in each and the highest HD resolution is 1920×1080. There are also few intermediate resolutions which are mainly used by smaller display devices. This means that the highest HD resolution is 1920x1080p which is supported by larger LCD and plasma displays but currently there is no terrestrial television that broadcasts this way. Most HD televisions use either 720p or 1080i mode.
Of course, HDTV is not the last step in television resolution. As the technology will evolve there will come higher resolutions that will need higher bandwidths, new transmission equipment and new displays (TV sets). This is called development.