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Color Killer
The color killer is an electronic stage in color TV receiver sets which acts as a cutting circuit to cut off color processing when the TV set receives a monochrome signal. Monochromatic transmission When a receiver is tuned to a monochrome transmission, the displayed scene should have no color components. However, if there is a hardware failure in the color killer stage, false color patterns may be displayed even during monochrome transmission. In normal color reception, high frequency luminance is mistaken for color, causing relatively invisible false color patterns. The reason for this invisibility is due to a key feature of NTSC/PAL, chroma/luminance frequency interleaving, where these false patterns are in complementary colors for adjacent video frames, allowing the human eye to average out the false color patterns. If, during a monochrome transmission, a color killer failure allows the color processing to be activated when it shouldn't, a chroma subcarrier in the color proc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Monochrome
A monochrome or monochromatic image, object or palette is composed of one color (or values of one color). Images using only shades of grey are called grayscale (typically digital) or black-and-white (typically analog). In physics, monochromatic light refers to electromagnetic radiation that contains a narrow band of wavelengths, which is a distinct concept. Application Of an image, the term monochrome is usually taken to mean the same as black and white or, more likely, grayscale, but may also be used to refer to other combinations containing only tones of a single color, such as green-and-white or green-and-red. It may also refer to sepia displaying tones from light tan to dark brown or cyanotype ("blueprint") images, and early photographic methods such as daguerreotypes, ambrotypes, and tintypes, each of which may be used to produce a monochromatic image. In computing, monochrome has two meanings: *it may mean having only one color which is either on or off (also kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Colorburst
Colorburst is an analog video, composite video signal generated by a video-signal generator used to keep the chrominance subcarrier synchronized in a color television signal. By synchronizing an oscillator with the colorburst at the back porch (beginning) of each scan line, a television receiver is able to restore the suppressed carrier of the chrominance (color) signals, and in turn decode the color information. The most common use of colorburst is to genlock equipment together as a common reference with a vision mixer in a television studio using a multi-camera setup. Explanation In NTSC, its frequency is exactly 315/88 = 3.579 MHz with a phase of 180°. PAL uses a frequency of exactly 4.43361875 MHz, with its phase alternating between 135° and 225° from line to line. Since the colorburst signal has a known amplitude, it is sometimes used as a reference level when compensating for amplitude variations in the overall signal. SECAM is unique in not h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Analog Television
Analog television is the original television technology that uses analog signals to transmit video and audio. In an analog television broadcast, the brightness, colors and sound are represented by amplitude, phase and frequency of an analog signal. Analog signals vary over a continuous range of possible values which means that electronic noise and interference may be introduced. Thus with analog, a moderately weak signal becomes snowy and subject to interference. In contrast, picture quality from a digital television (DTV) signal remains good until the signal level drops below a threshold where reception is no longer possible or becomes intermittent. Analog television may be wireless (terrestrial television and satellite television) or can be distributed over a cable network as cable television. All broadcast television systems used analog signals before the arrival of DTV. Motivated by the lower bandwidth requirements of compressed digital signals, beginning in the 2000 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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NTSC
The first American standard for analog television broadcast was developed by National Television System Committee (NTSC)National Television System Committee (1951–1953), Report and Reports of Panel No. 11, 11-A, 12–19, with Some supplementary references cited in the Reports, and the Petition for adoption of transmission standards for color television before the Federal Communications Commission, n.p., 1953], 17 v. illus., diagrs., tables. 28 cm. LC Control No.:5402138Library of Congress Online Catalog/ref> in 1941. In 1961, it was assigned the designation CCIR System M, System M. In 1953, a second NTSC standard was adopted, which allowed for color television broadcast compatible with the existing stock of black-and-white receivers. It is one of three major color formats for analog television, the others being PAL and SECAM. NTSC color is usually associated with the System M. The only other broadcast television system to use NTSC color was the System J. Since the intr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Luminance
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle. Brightness is the term for the ''subjective'' impression of the ''objective'' luminance measurement standard (see for the importance of this contrast). The SI unit for luminance is candela per square metre (cd/m2). A non-SI term for the same unit is the nit. The unit in the Centimetre–gram–second system of units (CGS) (which predated the SI system) is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2. Description Luminance is often used to characterize emission or reflection from flat, diffuse surfaces. Luminance levels indicate how much luminous power could be detected by the human eye looking at a particular surface from a particular angle of view. Luminance is thus an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Israel Broadcasting Authority
The Israel Broadcasting Authority (IBA; ) was Israel's public broadcaster from 1948 to 2017. History The Israel Broadcasting Authority was an outgrowth of the radio station '' Kol Yisrael'', which made its first broadcast as an independent station on 14 March 1948. The name of the organization operating ''Kol Yisrael'' was changed to ''Israel Broadcasting Service'' in 1951. The law creating the ''Israel Broadcasting Authority'' was passed by the Knesset on 6 June 1965. Television broadcasts commenced on 2 May 1968, with color television following on 23 February 1983, although occasional color transmissions, of such events as the Eurovision Song Contest 1979 and the visit of the Egyptian President Anwar Sadat in 1977, had been made earlier. IBA operated two television channels and eight radio stations. In 1990, the Israeli parliament passed a law that resulted in the creation of the Second Israeli Broadcasting Authority, whose function was to enable and regulate commercia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Burst Phase
Burst phase is the first ten cycles of colorburst in the "porch" of the synchronising pulse in the PAL (Phase Alternation Line) broadcast television systems format. The frequency of this burst is 4.43361875 MHz; it is precise to .5 Hz, and is used as the reference frequency to synchronise the local oscillators of the colour decoder in a PAL television set A television set or television receiver, more commonly called the television, TV, TV set, telly, tele, or tube, is a device that combines a tuner, display, and loudspeakers, for the purpose of viewing and hearing television broadcasts, or using .... This colorburst is sometimes called a "swinging burst", since it swings plus or minus 45 degrees line by line (hence the expression "phase alternating line"). This swing is used to set the centre frequency of the colour reference oscillator in the decoder. The swing of the burst phase distinguishes PAL from non-PAL lines, and produces the IDENT signal. Television te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Yediot Aharonoth
''Yedioth Ahronoth'' ( he, יְדִיעוֹת אַחֲרוֹנוֹת, ; lit. ''Latest News'') is a national daily newspaper published in Tel Aviv, Israel. Founded in 1939 in British Mandatory Palestine, ''Yedioth Ahronoth'' is the largest paid newspaper in Israel by sales and circulation.The Israeli Press Jewish Virtual Library History
''Yedioth Ahronoth'' was established in 1939 by an investor named . It was the first evening paper in
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Ynet
Ynet (stylized as ynet) is one of the major Israeli news and general-content websites, and is the online outlet for the ''Yedioth Ahronot'' newspaper. However, most of Ynet's content is original work, published exclusively on the website and written by an independent staff. History Ynet was launched in June 2000 in Hebrew only; and in 2004 launched its online English edition Ynetnews. In addition, Ynet hosts the online version of Yedioth Aharanot's media group magazines: Laisha (which also operates Ynet's fashion section), Pnai Plus, Blazer, GO magazine, and Mentha. For two years, Ynet had also an Arabic version, which ceased to operate in May 2005. Ynet's main competition comes from Walla! Mako and Nana. Since 2008, Ynet is Israel's most popular internet portal, as measured by Google Trends. In celebration of Israel's independence day in 2005, Ynet conducted a poll to determine whom Ynet readers consider to be the greatest Israelis of all time. The top 200 results were p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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SECAM
SECAM, also written SÉCAM (, ''Séquentiel de couleur à mémoire'', French for ''color sequential with memory''), is an analog color television system that was used in France, some parts of Europe and Africa, and Russia. It was one of three major analog color television standards, the others being PAL and NTSC. This page primarily discusses the SECAM colour encoding system. The articles on broadcast television systems and analog television further describe frame rates, image resolution, and audio modulation. SECAM video is composite video because the luminance (luma, monochrome image) and chrominance (chroma, color applied to the monochrome image) are transmitted together as one signal. All the countries using SECAM are currently in the process of conversion, or have already converted to Digital Video Broadcasting (DVB), the new pan-European standard for digital television. SECAM remained a major standard into the 2000s. History Development of SECAM predates PAL, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Frequency Modulation
Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and Run-length limited#FM: .280.2C1.29 RLL, computing. In Analog signal, analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the instantaneous frequency deviation, i.e. the difference between the frequency of the carrier and its center frequency, has a functional relation to the modulating signal amplitude. Digital data can be encoded and transmitted with a type of frequency modulation known as frequency-shift keying (FSK), in which the instantaneous frequency of the carrier is shifted among a set of frequencies. The frequencies may represent digits, such as '0' and '1'. FSK is widely used in computer modems, such as fax modems, telephone caller ID systems, garage door openers, and other low-frequency transmissions. R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Television Technology
Large-screen television technology (colloquially big-screen TV) developed rapidly in the late 1990s and 2000s. Prior to the development of thin-screen technologies, rear-projection television was standard for larger displays, and jumbotron, a non-projection video display technology, was used at stadiums and concerts. Various thin-screen technologies are being developed, but only liquid crystal display (LCD), plasma display (PDP) and Digital Light Processing (DLP) have been publicly released. Recent technologies like organic light-emitting diode (OLED) as well as not-yet-released technologies like surface-conduction electron-emitter display (SED) or field emission display (FED) are in development to replace earlier flat-screen technologies in picture quality. Large-screen technologies have almost completely displaced cathode-ray tubes (CRT) in television sales due to the necessary bulkiness of cathode-ray tubes. The diagonal screen size of a CRT television is limited to abou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |