HDTV - "High-definition Television." This is the most superior video picture available in Digital TV. In the U.S., the 1080i and 720p formats in a 16:9 aspect ratio are the two acceptable HDTV formats. HDTV is a component of DTV.
Generation Loss - This refers to video degradation caused by successive recordings (dubs of other dubs) from the master source. This is overcome by digital recording.
Widescreen - see 16 - 9
Resolution - The level of resolution directly affects picture quality. The higher the resolution, the more picture detail there is. Many things affect picture quality, including number of bits, pixel count, format, receiver quality, cameras, lenses and lighting used for live or taped programming. Resolution is measured by the number of pixels displayed. One of the high-definition picture formats is composed of 1080 active lines, and each line is composed of 1920 active pixels. Therefore, each frame has over 2 million (1080x1920=2,073,600) color pixels creating the image. By way of contrast, today's typical analog television is roughly equivalent to 480 active lines, with each line holding about 440 pixels. So, each frame has a little over 200,000 color pixels in use creating the image.
DTV - "Digital television." This comprises all the components of digital television, including HDTV, SDTV, datacasting, and multicasting, falling under the standards established by the ATSC.
Must-carry - This refers to the legal obligation of cable companies to carry analog or digital signals of over-the-air local broadcasters.
Sampling - This is the digital process by which analog information is measured, often millions of times per second, in order to convert analog to digital.
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