radio shack HDTV antenna

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HDTV stands for high-definition television. HDTV is the clear, lifelike picture itself, seen either at a friend's house or at a store, these experts say, it has six channels of CD-quality surround sound (left, right, center, left rear, right rear, and low frequency effects).

HDTV Knowledge:

A conventional aspect (square) image on a widescreen aspect (rectangular) display can be shown:

• in " pillar box " format, with black vertical bars to the left and right
• with upper and lower portions of the image cut off (or in "tilt and scan", parts selected by an operator)
• with the image horizontally distorted

Display technology

Thanks to advances in display technology, there are now several kinds of video displays used in modern TV sets:

• CRT : The most common displays are the ubiquitous direct view CRTs for up to 40in (100cm) (in 4:3) and 46in (115cm) (in 16:9) diagonally . These are still the least expensive, and are a refined technology that can still provide the best overall picture quality. As they do not have a fixed native resolution , in some cases they are also capable of displaying sources with a variety of different resolutions at the best possible image quality.
• Rear projection : Most big screen TVs (up to over 100 inch (254 cm)) use projection technology. Three types of projection systems are used in projection TVs: CRT-based, LCD -based, and DLP (reflective micromirror chip) -based. Projection television has been commercially available since the 1970s, but could not match the image sharpness of the CRT; current models are vastly improved, and offer a cost-effective large-screen display. A variation is a TV projector , using the same technology, which can project onto a wall.
• Flat panel LCD or plasma : Modern advances have brought flat panels to TV that use active matrix LCD or plasma display technology. Flat panel LCDs and plasma displays are as little as 4in (10cm) thick and can be hung on a wall like a picture or put over a pedestal . Some models can also be used as computer monitors .

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