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TV Revolution
Digital TV is just the start of things, the real tv revolution is just getting started and will begin to make its mark this year. By 2010, it will begin to take off. By 2025, it will be the standard for all Digital viewing. It's called Internet Protocol Television, or IPTV for short. IPTV works with...
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Digital TV Guide UK
Good news digital TV is here!
What is so great about digital TV, you wonder?
Well, for one thing resolution is much improved. Currently, analog television provides up to 500 lines of resolution. The resolution of an analog TV is 720 x 486 for a total of 349,920 pixels. Digital TV especially high definition television provide resolution of up to 1920 x 1080 pixels. which gives total of 2,073,600 pixels. That means the resolution of high definition TV is 6 times greater than analog television. Also, the pixel in analog television resembles that of a tall building that is it is tall and rectangular. HDTV pixels are 4 times smaller which means you get 4 times more pixels in a given area and giving four times more resolution. That means you get sharper and clearer pictures.
High definition TV has a aspect ratio of 16:9 while analog TV has an aspect ratio of 4: 3. Our field of vision is more attuned to a wider view . We have a rectangular field of vision rather than a square one . That means our eyes see more of the left and right rather than the top and bottom. A wide screen image fills more of our field of vision and provide a better picture. Films and movies are also made closer to 16:9 ratio aspect so when these movies are shown on TV you wouldn't get your picture cut off or the annoying black strips on your TV set.
The whole process is now repeated for the even rows. The process creates artifacts such as visible scan lines and becomes more apparent as the size of the TV screen increases. The flickering which occurs also makes our eyes tired. Digital TVs support progressive scanning which draws 60 full frames in a second instead of only 60 half frames in a second. You get a smoother image with less flicker and scan lines are hardly noticeable.
Remember your disappointment on seeing a NSTC TV screen with snowy images /ghostly images? This is because of broadcast signal is being blocked or the broadcasting station is too far. Well, you won't have this problem if you have a digital TV. Images are either picture perfect and you don't receive it at all. This is the nature of digital technology which is either 1 or 0.
In time to come, digital television would encompass the use of interactive television. Instead of just sitting in front of your television being a couch potato, it offers you opportunity to shop online, play games and enjoy other activities.
About the Author The Author is the webmaster of Digital TV Guide and covers the use of Digital TV technology in the UK.
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