High Definition Versus Standard Definition

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If you have been in the market for a high definition television, a Play Station 3, a high definition DVD player, or a Blu-ray player, you have most certainly heard of HDMI, or High Definition Multimedia Interface. To most people, it just seems like one of the large jumble of cables and connectors that come with their television or home theater receivers. HDMI is more than just a port on the back side of your television, and the usually expensive cable that fits inside that little port. It means a set of rules for letting your high definition devices communicate electronically to bring you the picture you saw advertised.

Before high definition televisions were developed, most of our televisions gave us pictures in what is now considered a standard definition. The picture was pretty square, with an aspect ratio of 4:3. The resolution, or number of pixels that create the picture on your screen, was about 704 by 480 pixels. Pixels, of course, being the little dots that come together to make up an image. The picture on these standard definition televisions was interlaced with each piece of this moving picture was really only half of the picture. It moved so quickly that our human minds just could not pick up on it. The technology was like an electronic flip book. The images were scrolled through so quickly that it made a moving picture. These older televisions used to rely on only an analog signal. The current on these analog signals traveled at a constantly varying rate.

High definition televisions, along with all other broadcasting now, are digital. Instead of the old setups, high definition televisions run more similarly to a computer using forms of ones and zeros. The information travels through special cables in the form of electric pulses very distinct to your system. High definition televisions use an aspect ratio of 16:9 which gives them a widescreen view without those annoying black bars on the top and bottom of your television. This plays into the movie theater style viewing that has become popular in today's home theaters. These televisions will also have a higher resolution. Current high definition standards are allowing for a resolution up to 1920 by 1080 pixels. High definition can have progressive signals, which means that each frame in the moving image is a whole picture rather than just a half of a picture in standard definition.


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