High-definition television or HDTV, as it is often called, is a television technology that everyone talks about. In fact, this wasn't really new – it's been popular in Japan years ago – but it's now starting to stick to the US in a big way. Although HDTV is angry, and HDTV prices are rising, many Americans still don't know much about this amazing new TV format. In fact, there is one thing that not many Americans know, but perhaps the most important thing to know about HDTV is that it is a completely separate TV format from what comes before it. Knowing this fact alone will go a long way towards understanding the nature of HDTV and how to benefit from it in the home entertainment center.
Once you know that HDTV is a separate and distinct TV format, the next logical question is "What makes it different from other types of TV?" There are many things in reality. Although there are some standard HD TV programs that have a screen aspect ratio, all HD TV programs have the same 16: 9 aspect ratio as movies shown in theaters and any programs that have a wide screen format. Another major difference is the resolution of the image. TV images are measured by the number of horizontal lines of the accuracy that make up them and the pattern on which these lines are erased on the screen. For example, a standard definition television has four hundred and eighty horizontal lines of resolution that are scanned in two separate steps. First, the odd-numbered lines are scanned on the screen, followed by a small fraction of a second later by even-numbered lines, which results in a complete picture. This pattern is called a tangle pattern and hence the standard definition TV is said to have 480i resolution. If all lines of precision are immediately erased at once, they will be scanned using a progressive pattern indicated by the symbol "p" after the number. 480p is definition TV and free from some visual defects that accompany overlapping scanning. HDTV has much higher resolution than standard definition or enhanced HDTV. HDTV can have 720p, 1080i, or 1080p resolution. Note that 1080p is still not well supported.
These differences between standard definition and HDTV make it easy to see why HDTV programming is needed to get the most out of your HDTV. Standard definition television programs simply do not have the resolution or aspect ratio to perform high-format coordination. For this reason, it is a good idea that Dish Network provides more HDTV channels than anyone else and has been integrated into affordable software packages. Currently, Dish Network offers twenty-five national channels in the high-level entry package and thirty national channels in the first HDTV package. Dishes can also provide HD television channels in the markets where they are served. Although this may not look like much of a channel, it is useful to keep in mind that these channels are much more than the channels available in the air in any given region before the advent of cable or satellite TV channels. Even twenty-five channels are also much more than any other TV service provider offers. All of these factors make the Dish Network a good choice for the HDTV you need.