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What Is HDTV?
Some satellite TV providers such as Dish Network, offer HDTV receivers with their packages. But many people do not know what it means to have HDTV. Here are some clues.
High Definition Television HDTV is what literally means. But high definition compared to what? In order to answer this question, we need to know a little ‘for the original system analog TV.
Analog TV
30 frames per second (in Europe 25) are indicated by normal analog TV. He does this by writing image lines horizontally, 525 lines in an image (in Europe 625) on the screen. The number of pixels on a single line is about 500. This would be a definition of 500 pixels per line by 525 (or 625) lines. Compared to modern computer monitors this is really bad. Even the lowest resolutions monitors have higher resolution (640 x 480) to an analogue TV set.
HDTV – High Definition Television
HDTV high-resolution digital television (DTV) combined with Dolby Digital Surround Sound (AC-3). There are 18 different formats defined for Digital TV of which 6 are considered HDTV.
The difference between progressive and interlaced is not difficult. It has to do with a single image is built. With the technology interlaced odd rows are shown first and then the even lines are shown. The lines are shown in this order: 1,3,5, … , 521, 523, 525, 2, 4, 6, …. 522, 524, 1, 3, etc. This means that every 1 / 60 of a half-second image is displayed. This often results in flicker that can be tiring for the eyes.
Progressive technology, can show a full image every 1 / 60 of a second, resulting in a much more straightforward.
How is HDTV better?
Normal TV has a resolution of about 210.000 pixels. An HDTV screen has a resolution of up to 2,000,000 pixels, which offers up to 10 times more image detail.
Ration aspect of normal TV is 4 x 3 (4 / 3 times wider than high). An HDTV screen has an aspect ration of 16 x 9, which is also known as the big screen.
The Future of HDTV
The FCC (Federal Communications Committee) has mandated that all television stations in the United States must be capable of transmitting HDTV programs by the year 2006. The mandates of the FCC does not have an impact on their companies for transmission, but also cable companies and consumers.
Broadcast companies must invest in new equipment such as cameras, editing equipment, etc.
The cable companies are converting all their equipment, including receivers in the homes of their clients.
Consumers may have to purchase new equipment as a top box to convert digital signals back to analog signals, or even buy a whole set of new TV channels.
HDTV is the future, and truly a great step forward. We started with a simple black and white TV, then moved to color TV, and TV in widescreen. But all these systems are still based on the same signals as the original black and white TV used. Color TV, when it was introduced it was not possible to compel the total population to throw away their black-and-white TV set and buy a color TV. Therefore, a color TV signal still needs to be understandable for a TV in black and white. This prohibited the improvement of image quality until the age of digital TV.
The need to satisfy old TVs no longer exists and the very highest-quality HDTV is available via Satellite TV Systems, including Dish Network.
By:http://www.isnare.com/?aid=34391&ca=Computers+and+Technology