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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. Hardware failure in the color killer stage may cause false color pattern display 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 color processing activation when it should not, a chroma subcarrier in the color processing stages is regenerated wit ... [...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 (a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Colorburst
Colorburst is an analog and 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 ... [...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, instantaneous phase and frequency, 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 Noise (video), snowy and subject to interference. In contrast, picture quality from a digital television (DTV) signal remains good until the signal level drops below digital cliff, 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 requ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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NTSC
NTSC (from National Television System Committee) is the first American standard for analog television, published and adopted in 1941. In 1961, it was assigned the designation System M. It is also known as EIA standard 170. 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; this combination is sometimes called NTSC II. The only other broadcast television system to use NTSC color was the System J. Brazil used System M with PAL color. Vietnam, Cambodia and Laos used System M with SECAM color – Vietnam later started using PAL in the early 1990s. The NTSC/System M standard was used in most of the Americas (except Argentina, Brazil, Paraguay, and Uruguay), Myanmar, South Korea, Taiwan, Philippines, Japan, and some Pacific Isl ... [...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. The procedure for conversion from spectral radiance to luminance is standardized by the CIE and ISO. 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 det ... [...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, succeeded by the Israeli Public Broadcasting Corporation. 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 Autho ... [...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 0.5 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 TV, TV set, television, telly, or tele) is an electronic device for viewing and hearing television broadcasts, or as a computer monitor. It combines a tuner, display, and loudspeake .... 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 at 7.8 kH ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Yediot Aharonoth
(, ; lit. "Latest News") is an Israeli daily mass market newspaper published in Tel Aviv. Founded in 1939, is Israel's largest paid newspaper by sales and circulation and has been described as "undoubtedly the country's number-one paper."The Israeli Press Jewish Virtual Library It is published in the tabloid format. It is known as centrist, compared to the left-leaning '''' and right-leaning, distributed-for-free '' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Ynet
Ynet (stylized in all lowercase) is an Israeli news and general-content website, and the online outlet for the '' Yedioth Ahronoth'' newspaper. History Ynet launched on June 6, 2000, in Hebrew, following other Hebrew outlet's website launches including ''Haaretz'', Maariv and '' Globes''. According to ''Globes'', the launch of Ynet may have been delayed due to concerns about Ynet cannibalizing the '' Yedioth Ahronoth'' newspaper. The website had 130 staff members at launch, and the original columnists included Ofer Shelah and Gadi Taub. Its content is separate from the newspaper. In addition, Ynet hosts the online version of Yedioth Aharanot's media group magazines: Lalsha (which also operates Ynet's fashion section), Pnai Plus, Blazer, GO Magazine, and Mentha. For two years, Ynet also had an Arabic edition, which ceased operation 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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SECAM
SECAM, also written SÉCAM (, ''Séquentiel de couleur à mémoire'', French for ''sequential colour memory''), is an analog color television system that was used in France, Russia and some other countries or territories of Europe and Africa. It was one of three major analog color television standards, the others being PAL and NTSC. Like PAL, a SECAM picture is also made up of 625 interlaced lines and is displayed at a rate of 25 frames per second (except SECAM-M). However, due to the way SECAM processes color information, it is not compatible with the PAL video format standard. SECAM video is composite video; 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 have either converted to DVB, Digital Video Broadcasting (DVB), the new pan-European standard for digital television, or are currently in the Digital television transition, process of conversion. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Frequency Modulation
Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In frequency modulation a carrier wave is varied in its instantaneous frequency in proportion to a property, primarily the instantaneous amplitude, of a message signal, such as an audio signal. 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 voice and 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 m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Television Technology
The technology of television has evolved since its early days using a mechanical system invented by Paul Gottlieb Nipkow in 1884. Every television system works on the scanning principle first implemented in the rotating disk scanner of Nipkow. This turns a two-dimensional image into a time series of signals that represent the brightness and color of each resolvable element of the picture. By repeating a two-dimensional image quickly enough, the impression of motion can be transmitted as well. For the receiving apparatus to reconstruct the image, synchronization information is included in the signal to allow proper placement of each line within the image and to identify when a complete image has been transmitted and a new image is to follow. While mechanically scanned systems were experimentally used, television as a mass medium was made practical by the development of electronic camera tubes and displays. By the turn of the 21st century, it was technically feasible to replace ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |