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HDTV stands for high-definition television. HDTV is truly outstanding, it has exceeded our belief in terms of its popularity and in terms of its beauty.

HDTV Knowledge:

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 .

MPEG-2 is most commonly used as the compression codec for digital HDTV broadcasts. Although MPEG-2 supports up to 4:2:2 YCC chroma subsampling and 10-bit quantization, HD broadcasts use 4:2:0 and 8-bit quantization to save bandwidth. Some broadcasters also plan to use MPEG-4.

Some German broadcasters already use MPEG-4 together with DVB-S2 (ProSieben, Sat1 and Three Premiere Channels). Recommended receiver is Humax PR-HD 1000, but others are announced as well as PCI cards. It seems likely that all European HDTV may be MPEG-4 and Ireland, which has not yet started ANY Digital Television, is considering MPEG4 for SD Digital as well as HDTV on Terrestrial broadcasts.

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