HDTV plasma

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HDTV stands for high-definition television. HDTV is going to be uniformly as glorious as the pristine demos you might see in well-calibrated retail showrooms, it has some unique features that are designed to give you an absorbing, exciting and relaxing viewing experience.

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The fact that a product bears the label "HD ready" does not necessarily mean that it can display the full picture resolution possible from a HD source. Most HD-ready sets do not have enough pixels (1920x1080 or 1280x720) to give true pixel-for-pixel representation without interpolation of higher HD resolutions.

Theoretically, even pixel-for-pixel is not enough, as sampling theory shows that proper image reconstruction requires more pixels in the display than were used for the original picture. This is why SDTV video sources (especially DVD) look much better on a HDTV than on the best SDTV (this is a consequence of basic sampling theory, and not a matter of image enhancement).

The term HD compatible is also being used in the UK to indicate that a display device has HDMI capability but with lower than HD-ready resolution.

When Europe resumed TV transmissions after WWII, i.e. in the late-1940s and early-1950s, different countries used different resolutions. The UK used 405 lines, most other countries 625 lines (both numbers include the vertical gap, the actual resolutions were lower), but France decided in 1948 to go for 819 lines.

The French TV system thus became the world's first HDTV system, and, by today's standards, the French system could be called 755i (not all lines could be used for the actual image ¡ª some lines were lost during the vertical retrace). The French 819-line (or 755i) HDTV system was introduced in the 1950s. When, in the late-1960s, a second TV channel and color TV were introduced in Europe, the UK dropped its 405-line TV system (completely in 1985) and France dropped its 819-line system (again, with final transmissions from Paris in 1985), making all European countries agree to use 625 lines (576i) for their TV transmissions.

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