Online Shopping - Buyers Guide For TelevisionsNowadays when we consider buying a new television set there are so many avenues of choice, which can make it difficult to know which one to purchase, especially when the advertising jargon sounds like a foreign language! The below guide to televisions will help to unscramble the technical terminology so that the choice you make is an informed choice. TELEVISIONS - SOUNDMono:- the sound comes through a single channel, even if the TV has two speakers. Nicam Stereo:- Although you can still hunt around for a mono sound set if you wish the price of Nicam Stereo televisions have crashed to such affordable levels that it's unlikely you'll want to consider anything less. The sound comes through two channels and creates a more realistic, richer sound experience. Televisions with this facility deliver CD quality digital stereo sound through your television. Nicam also carries Dolby Surround Sound for those who want to add additional external speakers to their system. So if you plan to upgrade in the future, you should make sure you are purchasing a Nicam equipped set. Virtual Surround:- Thanks to modern techniques you can experience audio effects similar to genuine surround sound through only two speakers. Many televisions now provide connections that allow external speakers to be added to intensify the surround effect. Dolby Surround:- One of the most advanced and thrilling sound systems on the market. The audio signal is split into five with speakers arranged both in front and behind the audience creating a real cinematic audio experience. A fractional delay is introduced to the rear speakers, creating the much sought after surround sound effect. TELEVISIONS - TECHNOLOGYTube:- The most common technology found in most conventional television sets is the cathode ray tube. Today there are several types of picture tubes, among others flat tubes that give a very sharp and flicker free picture. The main disadvantage with tube technology is that most tubes are fairly cumbersome, so these types of TVs generally take up quite a bit of space. Flatscreen TV:- These have been around for a long time. With the older televisions the cathode ray tube has a distinct curve to it. Flatter screens reduce the reflection of lights that these older screens suffer from and also minimise picture distortion. Projection TV:- Instead of one picture tube these TVs have three. A red, a blue and a green cathode ray tube. Picture quality on Projection televisions is generally considered superb, and because they do not utilise the old cathode ray tubes of conventional televisions, the picture is truly flat. Usually you'll find these sold as Rear Projection sets, which simply means that a device inside the television projects the image onto the back of the screen. You can also get Front Projection sets in which the picture is projected overhead. However these really have professional applications and would not suit a home setting. The advantage is that you can easily project to a large surface area without too much loss of quality. A disadvantage is that it is still very expensive to buy. Plasma:- Incredibly thin and lightweight, Plasma TVs are capable of being mounted on your wall like a painting. This latest television technology uses a lightweight surface that is covered with millions of tiny phosphor coated glass bubbles, each containing a plasma, which without getting too deep into the physics, is a gas-like substance. Each also has a red, green and blue component. When you switch on the TV, a digitally controlled current flows into the screen, causing the plasma in specific bubbles to give off ultraviolet rays. These cause the phosphor coatings to glow the appropriate colour. The result is a screen with millions of picture elements producing a strikingly clear and colourful picture. Unfortunately televisions using plasma technology are still very expensive. Digital TV:- Digital TV offers digital quality picture and sound with more channels to enjoy and up to 200 Interactive services. These televisions offer the facility to e-mail while you watch your favourite programmes and there are also interactive games to enjoy. TELEVISIONS - SCANNING FREQUENCY50 Hz:- The picture is updated 50 times per second. As the human eye can't work that fast the brain is fooled into seeing a perfect image. However, with larger screens, the flicker effect starts to become very slightly perceptible. 100 Hz:- The picture is updated 100 times per second, giving a sharper picture with less obvious "flicker". TELEVISIONS - PICTURE FORMAT4:3:- The standard picture format is 4:3, which is the relation between the breadth and height of the TV screen. This is the almost square picture format that has been prevalent in the home since TV was first invented. Widescreen:- These televisions have a 16:9 ratio. Even if you've not yet invested in a Widescreen television, you've almost certainly noticed that many programs are now broadcast in the format, with telltale black strips at the top and bottom of the picture. You can expect this trend to continue with DVD's routinely presented in this way. The widescreen ratio is actually a more naturally comfortable viewing format for the human field of vision than the conventional square (or 4:3 ratio) format, which also allows you to see films exactly as the director intended, making for a much more impressive experience. TELEVISIONS - OTHER INFORMATIONSCART Sockets:- A SCART connector is a 21 pin electrical lead that connects one audio-visual product with another (e.g. a television and a video recorder). This is essential when linking a stereo, video and TV. AV Socket:- Audio-visual connections enable other electrical goods to be run through the television set. Many televisions now come with an AV socket at the front of the set. This easy accessibility is ideal for those who want to use the TV to connect to a games console or a camcorder.
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