1) " Hdtv" -- As it applies to Hdtv Set Top High-definition television (HDTV) means broadcast of television signals with a higher resolution than traditional formats ( NTSC, SECAM, PAL ) allow. Except for the early analog HDTV format in Japan, its introduction coincides with that of digital television (DTV). Contents 1 Technical details 1.1 ATSC 1.2 DVB 2 History outside the US 2.1 Japan 2.2 Europe 3 Adoption 3.1 United States 3.2 Canada 3.3 Europe 3.3.1 European Union 3.3.1.1 France 3.3.1.2 Germany 3.3.1.3 United Kingdom 3.4 Japan 3.5 Republic of Korea 3.6 Australia 3.7 Brazil 3.8 Mexico 4 Recording and prerecorded media 5 References 6 See also 7 External links Technical details An HDTV-compatible TV usually uses a 16:9 aspectratio. The high resolution images (1920 pixels × 1080 lines or 1280 pixels × 720 lines) allow much more detail to be showncompared to analog television or regular DVDs. MPEG-2 is currently used as thecompression codec. The images are expected to be at least 6 times as sharp as standard definition television or analog television. Like NTSC and PAL, most 1920 × 1080 broadcasts use interlacing to reduce bandwidth demands. Alternating scan lines are broadcast 60 times a second, similar toNTSC's 60 Hz interlacing. This format is entitled 1080i, or 1080i60. In areastraditionally using PAL 50 Hz 1080i50 is also used. Progressivescan formats are also used with frame rates up to 60 per second. The 1280 × 720 format in practice is always progressive scan (with the entire frame refreshed each time) and is thustermed 720p. Several US broadcasters currently broadcast 720p60 content. A mix ofinterlaced and progressive scan is also encountered, where the 1080i60 (or 50) signal can be deinterlaced by simple weaving of fields to frames, giving in effect a 1080p30 (or 25) image. ...
2) " Set" -- As it applies to Hdtv Set Top This article is about sets in mathematics. For other meanings, see Set (disambiguation). Sets are one of the most important and fundamental concepts in modern mathematics. Basic set theory, having only been invented atthe end of the 19th century, is now a ubiquitous part of mathematicseducation, being introduced as early as elementary school. This article gives a brief and basic introduction to whatmathematicians call "intuitive" or "naive" set theory; for a more detailed account see Naive set theory. For a rigorous axiomatic treatment of sets see Axiomatic set theory. Contents 1 Introduction 2 Describing Sets 3 The number of elements of a set 4 Subsets 5 Unions 6 Intersections 7 Complements 8 Further reading 9 References Introduction Informally, a set is just a well-defined collection of objects considered as a whole. The objects of a set are called elements or members. The elements of aset can be anything: numbers, people, letters of the alphabet, other sets, etc. Sets are usually denoted with capital letters, A, B, C, etc. Two sets A and B are said to be equal, written A = B, if they havethe same members. Describing Sets A set may be described by words, for example: A = the first three natural numbers greater than zero B = the colors red, white, blue, and green Another way to describe a set is to list its elements between curly braces, for example: C = {1, 2, 3} D = {red, white, blue, green} Even though two sets may be described differently, they still may be identical as sets. For example, for the sets describedabove, A = C and B = D, since they have precisely the same members. It makes no difference in what order the elements are listed, or whether there are repetitions in the list. For example, thethree sets: {2, 4}, {4, 2}, and {2, 2, 4, 2} are identical, since again, they all h...
3) " Top" -- As it applies to Hdtv Set Top This article is about the toy. For other uses of the term, see Top (disambiguation). A top with sides marked in Braille A top, or spinning top, is a children's toy that can be spun on an axis,balancing on a point. The top is one of the oldest recognizable toys found on archaeological sites. Besides toys, tops have also historically been used for gambling and prophesy. Some role-playing gamers still use tops to augment dice in generatingrandomized results. The action of a top relies on the gyroscopic effect for its operation.Typically the top will at first wobble until the shape of the tip and its interaction with the surface force it upright. Afterspinning upright for an extended period, the angular momentum, andtherefore the gyroscopic effect, will gradually lessen, leading to ever increasing precession, finally causing the top to topple in a frequently violent last thrash. The top is sometimes used to make a logical point. It is possible to say "the top is moving" without contradicting thestatement that "the top is standing still." The two statements can each be true in that each refers to a different kind of motion-- "the top is rotating around its axis, but the axis remains at the same spot," would be amore complete statement of both points. In general, the law of non-contradiction must be stated to allow for ambiguous subject or predicates, and so for contradictions that are only apparent. Types of top Concertina top Dreidel also spelled dradel Perinola Dueling top Bei-goma Beyblade Floating top [1] ( http: www.physics.ucla.edu/marty/levitron/ ) Gaming top Tippe top Whipping top Whistling top Dreidel The dreidel is associated with Chanukah. It has four sides: נ (Nun),ג (Gimel), ה (Hey), ש (Shin), and is usually pl...
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