High Definition TVS

High-Definition television (HDTV) was launched in the market in the year 1998. If stating the reference of HDTV to a common man, it is all about a superior resolution and digital surround sound quality in the new state-of-art technology model - HDTV. It refers to the broadcasting of signals with much higher resolution than before. Today around 80 other devices are sold in the market as HD but in actual they are not HD ready products. They may be good quality TVs, but they lack one necessary consideration of being high definition, which is the possession of a High Definition Multimedia Interface adaptors which automatically lets the TV set handle the high resolution images all by itself.

Panasonic TX-43P800 - 43" Multisystem Projection TV

Price: $1,874.95

Until now, the working of a TV involved some analog signal and a CRT init. The incoming signals were translated into a picture and sound with the help of the cathode ray tube. This conventional CRT set has a display of about 480 lines of pixels and all the signals worked well for years until the idea of higher resolution evolved. A higher resolution signal for better quality and more clarity could not have worked on this old model of CRT. The conversion of the signals lowered the quality leading to more degradation in the class of the display and sound in the traditional model with CRT.

The new HDTV is almost incomparable to the standard definition TV (SDTV) in many terms, like, that it has twice the resolution in comparison to that of the SDTV, which allows for finer picture quality.

Further, the range of broadcasting signal for HDTV can also handle higher aspect ratio pictures of higher resolution, without the use of letter boxing, thus further increasing the over all resolution for such signals. Letter boxing is the technique of compressing the widescreen images to video formats. Aspect ratio is the measurement of the image displayed, where the width of the image is divided by the height. A traditional SDTV uses an aspect ratio of 4:3, while a HDTV has a much higher aspect ratio of 16:9 which helps the HDTV to handle bigger pictures and there is no need for compression. HDTV also avoids the use of letter boxing; therefore, one can view the images in their original wide form.

The highest resolution of a SDTV is the lowest resolution of HDTV. For the reader's information, the highest resolution for SDTV is just 704 x 480 pixels, while the highest resolution for HDTV is 1920 x 1080 pixels. Therefore, a High Definition TV can display 10 times more pixels than an analog SDTV set. The frame rate, which is best described as the frames per second, or the time taken for a complete picture formation on the screen every second, is around 60 frames per second for a high definition TV.

To express the advantages of HDTV purely in non-technical terms for a common man to understrand, here are some of the points listed below:

1. Since High definition TV is a digital technology, it receives only transmitted digital signals. Therefore, what we have here is the presence of a signal or none at all.. There are no blurred signals or weak signals, or signs of signal interferences. An HDTV will either deliver an excellent picture, a still picture or no picture at all. You would never get a snowy or washed out image from a weak signal, which are the effects from signal interference, viz., the herringbone patterns, or vertical rolling.

2. Most HD programming TVs are presented in the 16:9 proportioned aspect ratios, with wide screens. These screens have some amount of empty space left out at its margins which can be used up easily in case of wide images. This displays the full width of the image.

3. There is also an option of enlarging the screen if a user wants to. In addition to this facility, the images can also be enlarged to fill up the whole screen; however this option will display a distorted, stretched-out picture.

4. A larger bandwidth is used for transmitting signals to HDTV, and therefore, a very realistic image is formed with true colours. The reason behind this is that, the different colours lie in different ranges of the bandwidth and with a larger bandwidth, a better picture quality is achieved.

5. Since the numbers of scanning lines are much more in a HDTV, providing a higher resolution, the visual information is about 2-5 times more detailed overall, in comparison to the normal SDTV. The spaces between scanning lines are smaller or invisible, producing a better picture quality .

6. For the user. the increased clarity and detail make larger screen sizes more comfortable and pleasing to watch.

7. Dolby Digital 5.1 sounds are broadcasted along with standard HDTV video signals, thus allowing full surround sound capabilities. While the standard television SDTV signals broadcast basic stereo audio signals. If in case one is not interested in buying a new HDTV but still wants to enjoy these advantages, these is still an option. You can use your computer to view HDTV, with the aid of ATi HDTV Wonder, which an antenna is picking up the airborne HDTV signals. This antenna born device also has inputs for cable/satellite signals which can be also used. If you have a decent and quality monitor, it might make sense and will save you lots of money to get an HDTV card for your computer.

This new invention of High Definition TVs is surely a noticeable leap in the history, thus giving higher standards to visual as well as sound quality. The true high-definition standard, in contrast, has brought in significantly greater resolutions for everybody to enjoy. The up coming new models of HDTV- 720p and 1080i formats, which are very common in today's HD television sets, bring images several times clearer than the standard definition TV model. For the time being, 1080p, the most highly developed and sophisticated HD standard model, has a much better image quality, than anything else out there in the market. All of the HD set-ups are designed for 16x9 widescreen televisions, just like today's movies. So just get out there and enjoy!

About the Author:

John Dulaney is an international traveler and an expert in overseas audio video equipment and cell phone communications when traveling abroad. His website Planetomni, carries thousands of multisystem TVs, VCRs, region free DVD players at deeply discounted prices. Planetomni also offers a large selection of prepaid cell phones, cell phone rental and satellite phones for rent or purchase.

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