GLOSSARY in Software

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GLOSSARY
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Emphasis A boost in signal level that varies with frequency, usually used to improve SNR in FM transmission and recording systems (wherein noise increases with frequency) by applying a pre-emphasis before transmission and a complementary de-emphasis at the receiver Encoders Devices that change component signals to composite signals; sometimes devices that change analog signals to digital (see ADC); sometimes scramblers All NTSC cameras include an encoder Because many of these encoders omit many of the advanced techniques that can improve NTSC CAV facilities can use a single, advanced encoder prior to creating a final NTSC signal Encryption Scrambling; considered important for signal security and pay-TV Enhanced Television (ETV) A type of interactive television technology favored by network broadcasters This technology allows content producers to send HTML data and graphical enhancements through a small part of the regular (US) NTSC analog broadcast signal called the Vertical Blanking Interval (see below) These enhancements appear as overlays on the video and allow viewers to click on them if they are watching TV via special set-top box/software services like WebTV, Wink, WorldGate, and more to come One major problem associated with enhanced TV today is that producers must pay close attention to timing information When the digital signal is more widely available, content producers won t have to worry about timing informaton European Standards Currently, 625 scanning lines and 50 fields per second as opposed to NTSC s 525/5994 This led to the opposition to the 1125/60 HDTV proposal when it was presented to the CCIR as a proposed worldwide standard European producers are developing their own ATV systems Even Number The number of scanning lines per frame possible in a progressively scanned television system An interlaced scan system must use an odd number of lines so that sequential fields will be displaced by one scanning line
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With a kick signal, however, even an interlaced system can use an even number of scanning lines Extensible Markup Language (XML) A language that acts as a metalanguage; XML allows programmers to use it to create their own markup languages for specific uses XML is written in Standard Generalized Markup Language (SMGL) Eye Tracking The pattern in which eyes follow a person or object across a television screen See also Dynamic Resolution Fiber Optics See Optical Fiber Field One complete vertical scan of an image In a progressive scanning system, all of the scanning lines comprising a frame also comprise a field In an interlaced scanning system, all of the odd-numbered or all of the even-numbered scanning lines comprise a field, and two sequential fields comprise a frame Field Alias An alias caused by interlaced scanning See also Interlace Artifacts Field Rate Number of fields per second Filter A device that allows certain parts of signals to pass through and stops others, in the same way that a coffee filter allows water and certain parts of the coffee to pass through while stopping the grounds Filters are always used in decoders and usually in encoders Filter Artifacts Artifact introduced by filters The most common visual artifacts introduced by filters are reduced resolution and ringing Flash Downloading The ability to automatically send software upgrades to a set-top box network Flicker A rapid visible change in brightness, not part of the original scene See also Flicker Frequency, Judder, LargeArea Flicker, and Twitter Flicker Frequency The minimum rate of change of brightness at which flicker is no longer visible The flicker frequency
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increases with brightness and with the amount of the visual field being stimulated In a recent study, a still image flashed on and off for equal amounts of time was found to have a flicker frequency of 60 flashes per second at a brightness of 40 foot lamberts (fL) and 70 at 500 Television sets generally range around 100 fL in peak brightness (although some new ones claim over 700) SMPTE recommends 16 fL for movie theater screens (although this is measured without film, which reduces the actual scene brightness by at least 50 percent) One reason for interlaced scanning is to increase television s flashing pictures to the flicker frequency without increasing bandwidth FM Frequency Modulation; the form of modulation used for television sound transmission in most of the world, for satellite video transmission, and for videotape recording Noise in an FM system is greater at higher frequencies, thus usually demanding emphasis Footprint A term used to define a logistical area in a region covered by a cable or satellite operator, although not necessarily served directly by them This term is also used to define the amount of space a particular piece of software or hardware takes up inside a set-top box Frame Rate The number of frames per second
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Frequency Repetition rate In electronics, almost invariably the number of times a signal changes from positive to negative (or vice versa) per second Only very simple signals (sine waves) have a single constant frequency; the concept of instantaneous frequency therefore applies to any transition, the frequency said to be the frequency that a sine wave making the same transition would have Images have spatial frequencies, the number of transitions from dark to light (or vice versa) across an image, or per degree of visual field Frequency Interleaving The process by which color brightness signals are combined in NTSC Frequency Multiplex See Multiplex
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