① using radio waves to transmit images of the device object. From the launch pad to become a kind of video signal transmission power went out, TV to receive the signal and then into images reflected in the screen. In addition to using the cultural and entertainment television and education, but also widely used in other technical and military aspects. ② the use of such devices transmit color image black and white ~ ~ ㄧ ㄧ ㄧ up look ~ ~.
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diàn shì
Activities using electronic image transmission technology, broadcasting and communications is an important way, that TV receivers
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No. 3
I still stare, glower. Ming Liu Ji, "stated Chi Fu": "liberal angry and TV Come, PI leopard roar and the mountain split."
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No. 4
Using radio waves to transmit images of the device object. From the launch pad to become a kind of video signal transmission power went out, TV receiver to receive the signal and then into images reflected in the screen. TV in addition to entertainment and education for culture, but also widely used in other technical and military aspects.
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No. 5
The use of such devices to send images.
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Etymology
In 1934, Sun Ming by the Central University in Nanjing University as an assistant early Yang Jian, developed China's first _set_ of cameras, transmit, receive and play television prototype. Yang Jian beginning to "TV" as the television in the corresponding Chinese name. In 1939, Sun Ming, duly put "TV" as the University of Nanking "Film Project" Ministry of the thirteenth class, "TV" became the official university curriculum.
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About TV
Television electricity transmission activities in real-time method of visual images. Similarity with the film, television, using the human visual show a residual effect of the gradient of the still image frame to form a visual moving images. TV transmitter systems to the scene by the various parts of brightness and color fine converted to electrical signals, the order of transfer. In the receiver geometry shown by the corresponding part of the fine brightness and color to reproduce the whole lot of the original image.
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Work
TV signal from a point to a plane in order sampling, transfer and reproduction is accomplished by scanning. National television scanning format is different in China is 24 frames per second, 625 lines per frame. Each scan line from left to right, top to bottom points of each frame by interlacing the odd rows, even rows two Saowan to reduce flicker feeling. Send image information during the scan. When the scanning electron beam from the end of the line is way back to the line before starting the next line flyback flyback lines, and every field from top to bottom Saowan, back to the top of the field flyback retrace blanking line should be . During the transmission line field line field blanking sync signal to the sending and receiving synchronous scanning to accurately reproduce the original image. TV camera is to light the scene as the focus on the photosensitive camera tube (or optical) on the target surface, target surface points of the photoelectron excitation or changes in photoconductivity with light intensity as the point varies. When the electron beam on the target surface scan, which produces a range of points in the scene is proportional to the brightness of light as electrical signals. Sent to the television receiver picture tube screen manipulation with the scanning electron beam and change the strength of the input signal. When synchronized with the transmitter scans, the tube that appear on the screen to send the original image. TV signal transmission allocation process in order to broadcast live in other cities, for example, generally from the camera, television broadcast center or car, and then the microwave trunk lines, transmitter, and finally to the user television receiver. In addition, television satellite and cable television are also national and regional television transmission cities effective means of distribution. 【TV】 band National standard TV signal scan and channel bandwidth is not the same, in accordance with the International Radio Consultative Committee (CCIR) to distinguish the recommendations of the Latin alphabet. If M on behalf of 30 frames per second, 526 lines per frame, the video bandwidth of 4.2 MHz, with FM and AM sound with the video below the total residual high-frequency bandwidth is 6 MHz; D, K on behalf of 25 frames per second, each 625-line frame, 6 MHz video bandwidth, high-frequency bandwidth of 8 MHz. All the video baseband television signals are modulated with audio signals to the very high frequency (VHF) or ultrahigh frequency (UHF) band on the radio emission. 】 【Color television system In addition to including the same scan in black and white TV, channel, etc. to the Latin alphabet to distinguish between the standard contents (Table 2), also based on hair color signal receiving end of three different encoding and decoding method to form a different color TV system. Broadcast color television system requirements and compatible black and white TV, which is black and white TV to color TV broadcasting income, black and white color TV broadcasting can be received, but received all black and white images and sound. To this end, color television in accordance with a certain percentage of additive color mixing of three primary colors including white light by mixing different colored light, including the principle of compatibility and compression and transmission for both bands, generally red (R), green (G) and blue (B) composed of three color signals luminance signal (Y) and blue, red two color difference signals (BY), (RY), in which black and white luminance signal can be used to send the image, color difference signals and luminance signal phase combination restore the red, green, and blue color signals. Therefore, compatible color television system to send the same except the brightness in the black and white television signals and audio signals, while the band still send the same video chroma signal. Chrominance signal is composed of two color difference signals of the video band high frequency modulated color subcarrier made. Modulated color difference signal in order to prevent overload, the blue, red difference signal (BY), (RY) is compressed, the compression of the blue, red difference signals U, V said. 2, PAL system of Federal Republic of Germany in 1963 to reduce the sensitivity of the NTSC system development phase of a standard, the official broadcasting in 1967, but also for the UK and China and other countries. PAL is the phase alternating line by line (Phase AlternationLine) acronym. The standard use of U, V color difference signals respectively for the initial phase of 0 ° and 90 ° of the two the same color subcarrier orthogonal frequency amplitude balance, and the V component of the color difference signal phase alternation line. Thus, chroma signal phase deviation between adjacent rows are off_set_ by averaging. This standard feature is not very sensitive to the phase deviation, and the transmission received by the emergence of multi-path ghosting color less affected. 4, all television signals to transmit TV video base band composite image signal. Black and white television all television signals include: scan-line during the inverse process (level), field (vertical) scan sync and blanking signals, scan time is black and white luminance signal process. Which receive the scan synchronous signal to synchronize to ensure the stability of the received image reproduction; retrace blanking signal used to eliminate the bright line interference; black and white black and white or color television luminance signal reception for black and white TV image. All television color television signal (Figure 2) except for the contents of the same in black and white TV, there are color burst signal and color signals. One color sync signal during the transmission process in the reverse scan, in NTSC system and PAL system, it provides receiver decoder color subcarrier frequency and phase reference, in the SECAM system, the identification signal as the line sequence. Chroma signal during the scanning process is both black and white luminance signal transmission, it occupies the high end of the video baseband small. Two color difference signal obtained by demodulation, black and white luminance signal from the baseband video frequency occupied most of the above, in addition to black and white television _set_s to receive black and white images, but also, and two color difference signal into the matrix with the network, reduced to red, green and blue color signals, amplified to the color picture tube display color images.
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A brief history
】 【Reason behind the invention of television TV is not what the individual inventions. It is a large country located in different historical periods and co-crystallization of the people. Early in the nineteenth century, people began to discuss and explore the image into electronic signals. In 1900, "television" has the word appears. People usually October 2, 1925 Scotsman 约翰洛吉贝 Stewart (John Logie Baird) in an experiment in London, "scan" a puppet of the television image as a symbol of the birth, he was called "TV the father. " However, this view is controversial. Because, also in that year, Americans Sifu Luo Jin (Vladimir Zworykin) in Westinghouse (Westinghouse) to his boss showed his television system. Although time is the same, but 约翰洛吉贝 Stewart (John Logie Baird) and Sifu Luo Jin (Vladimir Zworykin) have a television system is very different. In the history of the 约翰洛吉贝 Stewart (John Logie Baird) mechanical television system called television, and were called Sifu Luo electronic payment system for television. This difference is mainly due to the different transmission and reception theory. The development of television complex. Almost the same time, many people are doing likewise. U.S. RCA1939 launched the world's first black and white TV to color TV in 1953 to _set_ standards for the nation and the introduction of RCA color television in 1954. 【TV】 development Christmas 1883 Nuns Clain German electrical engineer with his invention of the "Nuns Clain disc" using mechanical scanning method, made the first launch of the experimental images. 24 lines of each piece of wire screen, and the image rather vague. 1908 UK Ken Peier. Swindon, Russia Luo Schenck made no electronic scanning principle, laid the theoretical foundation of modern electrical technology. 1923 Soviet-American plot Ziwa Li Jin Faming static storage type camera tube. Written description of the invention electronic scanning type CRT, which is a pioneer of modern television camera operation. 1925 UK John. Lodge. Baird, according to "Nipkow disk" to a new research, inventions mechanical scanning television camera and receiver. Screen resolution was only 30 lines line scanner scans per second, swept area only 5 times, the screen itself is only 2 inches tall, an inch wide. In the London store to the public made a big show. 1926 Baird made a broadcast to the British press, and received television performances. 1927 - 1929 Baird, the first time by phone electromechanical cable TV pilot; first short television pilot; British Broadcasting Corporation began the long-term continuous broadcast television programs. 1930 Of television broadcast images and sounds at the same time made. 1931 For the first time the film onto the TV screen. - People enjoy television in London, the British Jockey Club where the famous live. - United States invented the 25 per second can be reflected image tube TV device. 1936 BBC electromechanical television broadcasting by Baird, the first high-definition broadcast, entered the practical stage of the television image. 1939 Radio Corporation of America began broadcasting fully electronic television. Ruishifeipu invented the first black and white TV projectors. 1940 Gourma developed electromechanical U.S. color television system. December 17, 1949 Opened with the laying of the first in London and Su Deng. Be between Amalfi Stewart TV cable. 1951 H. Luo Faming three shots at the U.S. Shadow Mask Color Picture Tube, Loren of the invention of a single gun-type color picture tube. 1954 American Texan Instruments developed the first of the all-transistor television receiver. 1966 Radio Corporation of America developed the integrated circuit TV. 3 years later to produce devices with electronic adjustment Yi color television receivers. 1972 Japan developed a color television projector. 1973 Digital technology for television broadcasting, digital TV can be proved for satellite communications. 1976 Britain finished "TV Library" System, the user can directly check the TV news, books, newspapers or magazines. 1977 Britain developed the first portable TV. 1979 World's first "cable" opened in London. It is the invention of the British Post Office. It will be the computer where the information transmitted by ordinary telephone lines and displayed on the user's TV screen. 1981 Sony Corporation developed a pocket-sized black and white TV, LCD screen only 2.5 inches from the battery. 1984 Panasonic launched the "cosmic television." The system's picture width 3.6 meters high 4.62 meters, the equivalent of 210 inches, can be placed on large trucks on the streets and squares and other places need to play. Exclusive use of the system developed by Matsushita, "High-brightness LED color", even during the day, outdoors can be colorful and bright images. March 17, 1985 Tsukuba Science held in Japan World Expo, the Sony large screen color TV built wall appearance. It is located in the central square, 40 meters long, 25 meters high, covering an area of 1,000 square meters, the building is 14 story building that high. Quite a 1857 in. color TV. Large screen LED screen by the 36 major components, each weighing 1 ton, 1.8 m thick 4-line 9, a total of 450,000 works of color light emitting device. Through its top-mounted cameras, you can always display the meeting room, a variety of activities and play a variety of advertisements of Sony's video. 1985 British Telecom (BT) introduced integrated digital communications network. It provides users with voice, fast delivery chart, fax, slow scan television terminals. November 25, 1991 Sony Corporation of Japan start high-definition television pilot: the scan lines 1125, over 525 more than the current double the image quality increased by 100%; screen aspect ratio to change the traditional 9:12 am to 9:16, and enhance the viewer with a sense of the scene; EOC angle from 10 degrees to 30 degrees extension, reflect a deeper sense of graph; TV side as "pixels" from 280,000 to 1.27 million units to increase the screen size increased by nearly the amount of information in one fell swoop 4 times ... ... so, watch high-definition television screen, the distance is not high in the past but 3 times 7 times, and sound realistic, using 4-channel high-fidelity stereo sound, full of appeal. 1995 Sony has introduced ultra-miniature color television receivers (ie, handheld color TV), and only palm-sized, weighs 280 grams. With the speaker, there are headphone jack, LCD screen of about 5.5 cm, the screen seems small, but the image is clear, its most obvious features are: the human body for the antenna to get television ratings, watching TV when the two leads _set_ in the neck, you can get an outdoor antenna-like effect. 1996 Japan's Sony Corp. to market "wall" type of TV: the length of 60 cm, width 38 cm, while the thickness of only 3.7 cm, weighing only 1.7 kg, as a mural. September 2, 1958 China began to broadcast black and white TV, and the corresponding television industry. 1973 Start pilot color television. 【】 History of China's TV manufacturing industry In 1958, China's first Beijing Brand 14-inch black and white TV black and white TV was born in Tianjin, 712 plants. December 26, 1970, China's first color television was born in the same place, opened China's color TV production from the prelude. In 1978, the state approved the introduction of the first color TV production lines, designated in the original television factory which is now Shanghai SVA Group. Completed and commissioned in October 1982. Soon, the first domestic factory in Xianyang Rainbow CPT plant establishment. During this period China's color TV industry is rapidly heating up, and quickly scale, the national introduction of large and small, more than 100 color TV production lines, and the emergence of giant pandas, Venus, peony, leap a large number of domestic brands. In 1985, China's TV output has reached 16.63 million units, more than the United States, second only to Japan as the world's second largest producer of the TV. However, by the structure of China's TV market, prices, consumption and other conditions, TV penetration is still very low, every hundred urban and rural areas have TV _set_s, respectively, only 17.2 and 0.8 units. In 1987, China's TV output has reached 19.34 million units, surpassing Japan to become the world's largest TV producer. 1985-1993, China's color TV market to achieve a large-scale substitution from black and white television to color TV upgrade. In 1993, TCL launched in the first half began to "TCL trump card" big screen color TV, 29-inch color TV market price of 6,000 yuan, to the end of the year has sold more than 10 million units. March 1996, Changhong announced to the nation's Declaration of the first large-scale price - lower TV prices 8-18 percent, two months later, Konka subsequent follow-up, started the history of color TV industry price war of unprecedented scale . Year in April, Changhong's sales jumped market first, the domestic brands through the price war a significant market share of foreign brands in the hands of wins. This price war later led to the major reshuffle, China's color TV industry, TV production companies from dozens of exit. In 1999, the consumer plasma TV in the domestic stores. 40-inch plasma TV at the price of more than ten million. In 2001, the Chinese color TV Goes to area loss, Konka, Xoceco, High Road, Hua loss, Changhong is only 1 cent per share profit, this situation until 2002 can be reversed through technology upgrading. In 2002, Changhong announced the successful development of China's first largest LCD TV screen. The 22-inch screen size significantly exceeded the limit of traditional industry, the screen size of up to 30 inches, was known as "the first screen." In 2002, TCL launched Plasma TV "universal Storm", opened the plasma TV to consumers, the family's door. Hisense then follow up. April 2003, Ni Runfeng popularity of off plan projection, rear projection TV the maximum decrease of 40%. In 2004, the United States began to implement anti-dumping on Chinese color TV _set_s, resulting in China's color TV can not directly enter the U.S. market. In 2004, total sales volume is 35 million color TV _set_s, including flat panel TV sales in a mere 40 million units, accounting for 1.14% TV products. October 2004 start, flat-panel TV market in the domestic sales of several major cities for the first time over the traditional CRT (analog) TV. First half of 2005, China's flat panel TV sales reached 725,000 units, up 260%; LCD TV has a rate of urban households reached 3.56%, a plasma TV has reached a rate of 2.81%. Status】 【TV Now, the TV being a revolution. TV status: The current TV technology features one of the most obvious is digital. First, digital programming. The late nineties of last century, the British Broadcasting Corporation (BBC) established the first in the world, "Columbus" system. This system makes the BBC's television programs to store, edit, the full realization of the digital broadcast, the non-tape based, thus greatly enhancing the BBC's efficiency, saving production costs. In addition, agencies are now phasing out the television traditional analog cameras and video tapes, instead of emerging digital cameras and record carrier. This change has greatly improved the image quality. Secondly, the transmission technology diversification up. In addition to traditional wireless microwave transmission, but now there is cable TV, satellite TV transmission. These emerging effective in reducing the transmission signal during transmission attenuation would inevitably arise to ensure a better reception quality. Finally, the digital receiver technology changes. Improve the quality of sound and picture and digital two-way interaction is widely brought two of the largest benefits. The rapid development of television media, people should be too busy then, even more confused. Serious polarization in TV, well-known, such as BBC, CNN, several broadcasters hold a strong voice, strengthening the degree of specialization, in the face of the audience and more narrow. 【TV】 prospects The forward direction of television production for two. One is even more true of. That is more real to restore the event itself. For example, CNN news events in the use of a large number of live is one of a reflection. The other is even more dramatic, for example, CNN FOX NEWS relative to its program with plenty of dramatic language to "render" the U.S. war in Iraq. Of course, these two directions is the direction of two different kinds of programming, is always with them. Feature is more prominent recently. The addition of the phenomenon there, the program of narrowcasting, and other specialized channels. Meanwhile, more and more advanced in technology today, television as a tool is being used more by the state. For now the national power has not only limited to economic, military and other such traditional "hard" power of the category. Cultural soft power, the same should also be considered. Thus, television is considered to enhance the soft power of a country good tool. At present, this trend is intensified.
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TV Category
From the use of effects and shape to roughly divided into four categories: flat-panel TV (plasma, LCD and DLP rear projection part of the thin wall), CRT tube TV (flat screen CRT, ultra-flat CRT, ultra-thin CRT, etc.), rear projection TV (CRT rear projection, DLP rear projection, LCOS rear projection, LCD rear projection), projection TV. 1, flat panel TV: The main advantage is very thin, can be hung on the wall to watch, and they can do a great display (currently on the market for fine 60-inch and larger plasma and LCD up to 47 inches and above). But the drawback is that viewing angle, response speed, subject to certain restrictions, and the price is very expensive. 2, CRT tube TV (just say here that digital HD): The main advantage is the very best in all aspects (brightness, contrast is very high, viewing angle, fast response, color reproduction is also very good), but its maximum screen it is about 34 inches and very thick very heavy, but also costs of electricity. However, the price is very cheap compared. 3, rear projection (CRT rear projection, DLP rear projection, LCOS rear projection, LCD rear projection): the traditional CRT rear projection is not very popular, the market was digital projection (DLP rear projection, LCOS rear projection, LCD rear projection) grab left. DLP rear projection of light was the relatively popular, as it can be said to be true digital television, their performance is very good, big screen, small size of (the imaging principle, we have said many times, please email newspaper Web site to find the answer) , is currently the most popular kind. Since the LCD rear projection high heat, short bulb life issues such as slightly inferior. 4, the projection TV: I think we can see in the company conference room, the kind of civilian version of the projector, usually installed in the home can look at movies.
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Maintenance
1, when the machine abnormal sound or smell, immediately turn off and unplug the plug, has been recognized as an exception, do not continue to use to professionals overhaul. 2, such as a longer time to go out or do not watch TV for a long time, must take the TV off, unplug the power plug, disconnect the machine should be thunderstorm season with the antenna connection. 3, thunderstorms can not watch TV. Not yet reached before a thunderstorm and the antenna should unplug the power cord to prevent lightning strikes. By country, "Three Guarantees" lightning machine range of non-warranty machines. 4, do not place the TV cast fried flammable materials, candles, stoves, light bulbs Dengjun not on the machine and close to the machine where the machine to avoid accidents. 5, be careful of liquid metal into the TV body. If liquid metal falling into the machine, must not re-boot to use, professional treatment as soon as possible. 6, can not wipe the machine with a chemical reagent. Solvents may cause the housing deterioration and damage to the painted surface. If dust, dirt, should turn off the TV ten minutes then wipe with a damp cloth wrung, screen can be clean, soft cloth. 7 Do not wipe the dust of the screen. Dust the screen will automatically prevent dust contamination, if a little dust, dirt, use a soft silk gently whisk a few, do not wipe. 【TV】 Maintenance 1, the regular adjustments to the program location, key switch channels to avoid premature failure. 2, do not force plug cord to prevent the machine tuner or line damage. 3, less remote control switch, to shut off the mains. 4, thunderstorm days not only to unplug the antenna plug the weather, but also to unplug the power plug to prevent lightning strikes. 5, note that the magnetic field, to prevent the TV is magnetized. 6, flat on your TV, to prevent deformation of damage to the circuit board inside the machine. 7, pay attention to TV's heat and prevent overheating damage to components. 8, note that eliminate the use of hidden dangers, avoid metal objects have fallen into the TV, such as needles, paper clips, small nails, coins. 9, to prevent water entering the machine, the TV away from basins, pots, cups, plumbing and other items. 10, coal soot, the family should pay attention to the corrosion on the TV. 11, the remote control to use a transparent plastic bag, and to prevent dropping the ground. Second, the daily maintenance of the LCD TV LCD TV, the only part of a progressive consumption is the display of the background lights. After long-term use, you will find the screen becomes dim or simply not bright, in both cases, as long as the replacement of background lighting can make the LCD TV back to life and become as good as new. 1, to avoid screen burn inside Remember, CRT TV to work because of long-term burn, also the case for the LCD TV. So be sure to remember, if you do, be sure to turn off the LCD TV _set_, or a long time, can lead to burn out or the internal aging. This event is permanently damaged and can not be undone. So be sure to attract much attention. In addition, if a fixed time to display the contents of a row, it may cause some hot pixels LCD TV and cause internal burns. 2, to maintain the humidity Do not let any of what nature has moisture into the LCD TV. Found in mist, with a soft cloth to gently wipe before you can turn on the power. If the wetlands were already entered the LCD TV, LCD TV must be placed on to a more warm, dry place, so that when water is evaporated and organic compounds. LCD TV with humidity of power, can lead to corrosion of liquid crystal electrode, which causes permanent damage. 3, the correct cleaning the display surface If you find that the display surface stains, use a soft cloth moistened with a little glass cleaner, gently wipe, do not spill detergent directly to the display surface. Detergent into the LCD TV screen will result in short circuit. 4, to avoid unnecessary vibration LCD TV screen is very fragile, so avoid strong shock and vibration. LCD TV is about the home or office users all the supplies in the most sensitive electrical equipment. LCD glass and contains a lot of sensitive electrical components, fell to the floor or other similar LCD strong blow can cause damage to the screen and the CFL unit. Also careful not to put pressure on the LCD display surface. 5, do not disassemble One rule is never to disassemble the LCD TV. Closed for a long time even after the components of the CFL backlight inverter is still possible with a high voltage of about 1000V, this pressure can lead to serious personal injury. So do not you ever attempt to remove or change the LCD screen, so as not to experience high pressure. Unauthorized repairs and changes will lead to temporary or even permanent display does not work. Third, plasma TV's daily care and maintenance 1, the heat: heat generated by high power plasma TV can be seen as the number one enemy, so pay special attention to the use of plasma TV in the heat. 2, screen burn: for a long time leaving the screen still image playback fixed partial screen blur produced by the burn, which features a plasma television itself determined. 3, Voltage: the case of conditional plasma TV should provide independent power supply line, or to add a stable power supply is also a good choice. 4 Clean: regular screen plasma TVs make clean, to keep the screen surface is bright as a new way to keep a good picture quality. 5, moisture, dust, lightning: to keep the machine working environment is relatively dry, do not allow water to enter the body in; the machine when not in use, consider using a dust cover; for the configuration of plasma and peripheral electrical outlet to a lightning it. Fourth, how to maintain a TV remote control 1, please change the battery fails, the circuit board to avoid battery leakage and corrosion; 2, Do not let water or other liquids wet the remote control; 3, do not let children play with remote control, to avoid the broken remote control; 4, do not use solvents or harsh chemicals, rubbing the surface of the remote control, if slightly dusty, with a clean soft cloth or cotton can be gently wiped the dust; if serious surface dirt, required clean soft cloth or cotton dip of the neutral detergent to remove dirt and dry naturally on the line after. Fifth, how to extend the life of the TV 1, to prevent premature aging CRT. Measures are usually not open to watch the brightness is too bright, do not frequently switch TV, as far as the stability of the power to watch TV. The effective life of the general picture tubes were 5000-10000 hours, an average of 3-5 hours per day, then the general life tubes in 5-10 or more years is not a problem. 2, note that the TV cooling ventilation. Most of the parts inside the TV work to be hot, if the cooling effect is not good, the heat can not be distributed in time out, they will be increasing the temperature, so that damage. In addition, the TV using a long time, maintenance personnel should be requested to remove the dust inside. 3, do not use the TV instead of easily damaged, especially in the rainy season, often opening and the television, using the heat inside the machine to get rid of the moisture is essential. Sixth, the TV screen, remove dust TV use for too long, because the electrostatic attraction, the dust will appear on the screen, then do not scrub with chemical reagents (eg: alcohol). At present, many TV screens to enhance the effect of the surface of the screen protective film coated with a layer of oxide. If you use chemical agents to clean, will disrupt the layer of protective film that undue loss. The best way is to use the special screen cleaning materials. If there is no specific, you can use a napkin, a soft cotton cloth to gently clean, but be careful not to wet. Recommendation: 1) repeatedly switch the TV should not be uncontrolled, it will accelerate the aging of its service life; (2) color television _set_s are most afraid of strong magnetic field interference. With magnetic objects in the screen before the move will lead to the TV by the magnetic, color disorders, with particular attention to speakers, so do not put a magnet near the TV; (3) The TV should be placed in a cool, dry, ventilated environment, humid environment will result in failure rate, shorten the life of the TV; (4) use, the TV should be left around 5-10 cm above the space and pay attention to ventilation holes around the case will not be blocked. After the cooling off period before they can be TV covering the dust; (5) watching TV, the best use of the power switch, not the sake of convenience directly with the remote shutdown, remote shutdown power supply still working, not only the power , but can also cause long-term shutdown by remote magnetic phenomena; (6) thunderstorm, it is best to power plug and antenna (or cable) unplug the maximum to avoid the dangers of lightning, to ensure the safe use of the TV; (7 ) be taken to remove some of the hidden use, such as avoiding metal foreign body, the liquid fall into the TV, do not put lighted candles on the TV.
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_Select_ion Guide
TV】 【How to buy First, the normal TV: 1, Channel: General pre-_select_ed number of channels should be greater than 50 or more. 2 Image: General TV broadcast the 50 images per second, so that the speed of light flashes the naked eye looks a long period of time the eyes will fatigue. The 100Hz digital TV through digital signal processing, in a second broadcast to 100 images, so that greatly reduce image flicker level, image clear and stable, smooth, even for a long time watching TV, you will not find eye fatigue, are environmentally friendly products, economic conditions, the user should try to consider. 3, the screen: flat screen TV is another hot spot on the market recently. The advantage is that no matter what angle you look from the program, the image distortion can be reduced to a minimum, high image contrast, image-level more clear, more vibrant colors, can greatly reduce ambient light reflection on the screen. 4, use: market launch of the multimedia TV can be connected to a computer. In the current work does not change the premise of the TV, it uses digital storage and scanning technology, the computer image signal into the TV image signal, the television screen, so that as a large screen TV monitor. 5, Sound: NICAM function of the current TV has many types, but only in line with China was more suitable for the standard format of consumers. NICAM effective standard of Chinese Mainland and the Hong Kong PAL PAL-D. Second, the rear projection TV to buy: 1, the optional rear-projection TV should first consider the function and movement quality, advanced technology movement had a decisive impact on image quality. 2, the rear projection TV to reach at least 500 lines of resolution, to choose a high illumination projection TV. 3, the rear projection TV CRT TV than the average angle is small, so choose the size and brightness when the view is very important. 4, images, divided into brightness, noise points and color a few. First rear projection TV's brightness control by the dark turn bright, clear color cast does not appear to be better, if color cast is illustrated in color television cathode unbalanced. Second, in the case of no signal input noise point of view, the more noise points, the smaller, more rounded rear projection TV to illustrate the sensitivity higher. 5, the color, the color transferred to the hours, the image should be black and white, rich colors should be adjusted to the maximum, transferred to the appropriate location, the character color to be normal, the level should be obvious, no accumulation of large blocks of color. 6, sound, the size of the volume control potentiometer to change the size of clear sound, voice, and loud is better, should not be hoarse and hum. Third, the inspection when the attention, projection screen box cover seal is intact. Because once the dust falling into the gap through the box to the back of dirty lens and the screen will lead to decline in image quality, while the other key is to see if the screen scratches and scratches and defects, because the projection television screen than using a hard glass made of organic fabric but made of plastic, easy to scratch scratch scratch after the event not only for the screen repair. Do not use alcohol and other solvents screen wipe to avoid screen damage, not to put TV on top of things, to prevent the TV cabinet and screen distortion. Finally, seismic testing. Pat rear projection TV cabinet by hand, the image does not flash does not jump, no abnormal sound of the rear shock resistance good, otherwise bad.
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Related information
What is the TV screen 【Size】 General we are talking 32-inch LCD TV, 42 inch LCD TV 32-inch, 42-inch TV screen size is. TV TV screen size is a measure of the maximum possible display of parameters, it is to measure the length of the diagonal TV screen, the unit is usually inches. The characteristics of the LCD TV screen size. LCD TV screen size is strictly the product manual the size of the label, because there is no LCD screen obscured by the phenomenon of the border. LCD TV screen gives short weight phenomenon. Market size of individual products that are not real phenomena, mainly for less than the dimension of the standard size 1-2 cm, ie less than 1 inch away. 【TV and Internet audience fully interactive】 TV is a real-time media, can not be reviewed unless otherwise recorded or repeated viewing, and online media have obvious advantages in this regard, it has both the print media can always look at the advantages and overcome the timeliness, the lack of such classification and length of limited shortcomings, a fleeting television library database and classified information. Interactive television media has been explored in order to strengthen the links between communicator and audience, audience response and understanding the importance of means. Development of network technology to let people interact with a deeper understanding of the word, and written into the audience and media exposure life. The combination of television and the Internet is the best marriage. Absorb the contents of network television, TV with network platform, the real effect of the optimization of communication. 【TV】 Network IPTV or IPTV, is a use of broadband infrastructure, computer (PC) or "normal TV + network _set_-top box (TV + IPSTB)" as the main terminal device, to provide users with video on demand, Internet access, e-mail , games and other interactive digital media services to individual needs of new technology. Principle-based P2P Internet TV software, but different from other P2P network television, opening up the server side functionality, allowing users to add their own programs, find online can also be added into the program, based on the spread of P2P principles, the program can also be added. Teletext】 【 Teletext (Teletext) is a subsidiary business of television broadcasting. Teletext in Analog TV system, TV screen displays 25 frames per second television signal, 625 lines per frame, each scan line from the left of the screen to the right, two per frame from the screen top to bottom sweep. 625 lines per frame displayed on the screen actually only 575 lines, 50 line is the inverse process is invisible. Inverse process is often used to transmit the test signal, in addition can also be used to transmit additional data, including graphics, text. Using a dedicated audience at the receiver a teletext decoder can watch the screen the information transmitted. 【TV】 Conference The rise in recent years, video conferencing is a means of communication, video conferencing, the advent of greatly reducing the distance between people face to face communication, change the mode of the previous meeting, not only saves manpower, financial resources, but also improve efficiency. Video conference phone system is through the camera picked up images and sounds, through the codec into a digital signal and compress it, and then through the communication network to transmit signals out. The other will receive the digital signal decompression, to analog signals, through the display and speakers play out, the whole process is basically the "real time" carried out. Video conference phone system currently can only be held in the country.
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LCD TV
Now the development of society is the original small LCD TV television evolved into the present, both are convenient in that high-quality, color, screen, space, and volume to create the indoor atmosphere. Such as: the original all the time at home watching TV I like watching black and white science fiction film, but not very exciting, and now the LCD screen to you, look inside every detail of the science fiction films are unique, clear.
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Why do thousands of
TV is divided into numerous factors, a series of still images, continuous transfer out. Persistence of vision due to human function, so that a series of consecutive still images showing the feeling of moving scenery. TV cameras and film cameras in the same appearance, but the interior is vastly different. TV cameras in the film but not with the film cas_set_te to record images of the action. It is mainly used a special vacuum tube (camera tube). To be taken to the tube like projection screen or as screen. Screen covered with unusual sensitivity of the photosensitive layer; it is called by the hundreds of thousands of "pixels" of small dots, like the eye of the retina is composed of numerous nerve cells in the same. In order to screen projected onto the photographic image into electrical signals transmitted by the camera tube electron beam in a left to right, to sweep from top to Bian. These pixels, when the electron beam sweeps a certain point, it will be able to experience this intensity of light into electrical signals of different strength. Television system in China, the most common television screen is 600 lines, each have more than 800 small dots. In broadcast TV, broadcast 25 to the screen per second. Shows the image generated by the telecommunications numbers. Change is very rapid. Again the strength of the telecommunications numbers of radio waves transmitted signal modulation. Good modulation of radio carrier to go out from the TV transmitting antenna. When you turn on the TV, should _select_ such a good tune when radio is used to control these waves in the electron beam tube. CRT screen inner surface coated with fluorescent material film. Electron beam fluorescence film swept this layer, the electron beam sweeps from top to bottom several times per second for each part of the screen. Carried by the radio control of TV image signal strength of the electron beam scanning. Changing the strength of the electron beam hit the screen, resulting in a different light and dark spot, which swept a variety of images. Screen surface so the paint scenes, and a number of inside and outside the art scene captured by the camera exactly the same. TV and radio sound principle is the same.
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Encyclopedia
dianshi TV television Brief History In 1884, German scientists invented the PG Nipkow disk rotating spiral scanners, the battery ran out spot the image sequence into electrical pulses, to achieve the most original television transmission and display. CF Jenkins and the United States in 1925, the United Kingdom JL Baird in 1926 have achieved a rough video mechanical scanning television system. By 1932, it improved the 1923 U.S. gold VK Ziwo Lei iconoscope invention. PJ FAN Si Vaughan in 1930 invented the electronic scanning system and the RCA, the improvement of electron beam tube, into the modern era of television. In the UK in 1937, 1939, black and white television in the United States began broadcasting. To the early 50s, black and white TV broadcasts began to spread in all countries. China in 1958, black and white TV broadcasts. Later, people under the red, green, and blue shade added to get the base principle of the different color sense, the beginning of color television. The first pilot of a U.S. black and white TV is not compatible with the sequential color TV, 1953 is compatible with the NTSC color television standard, the official broadcast in 1954. Federal Republic of Germany, France have been in 1963, established in 1966, PAL and SECAM compatible color television system, side by side with the U.S. NTSC standard color television system in the world three, respectively, and regions in the world have been used. Most countries turned from the late 60's color television broadcasting, the Chinese began to develop from the early 70s color TV broadcasting, the use of PAL-D, K standard. Works point to a plane television signal sequence from the sampling, transport and reproduction is accomplished by scanning. National television scanning format is different in China is 25 frames per second, 625 lines per frame. Each scan line from left to right, top to bottom points of each frame by interlacing the odd rows, even rows two Saowan to reduce flicker feeling. Scanning is the process of sending image information. When the scanning electron beam from the end of the line is way back to the line before starting the next line flyback flyback lines, and every field from top to bottom Saowan, back to the top of the field flyback retrace blanking line should be . During the transmission line field line field blanking sync signal to the sending and receiving synchronous scanning to accurately reproduce the original image. TV camera is to light the scene as the focus on the photosensitive camera tube (or optical) on the target surface, target surface points of the photoelectron excitation or changes in photoconductivity with light intensity as the point varies. When the electron beam on the target surface scan, which produces a range of points in the scene is proportional to the brightness of light as electrical signals. Sent to the television receiver picture tube screen manipulation with the scanning electron beam and change the strength of the input signal. When synchronized with the transmitter scans, the tube that appear on the screen to send the original image. TV signal transmission allocation process in order to broadcast live in other cities, for example, generally from the camera, television broadcast center or car, and then the microwave trunk lines, transmitter, and finally to the user television receiver. In addition, television satellite and cable television are also national and regional television transmission cities effective means of distribution. TV band TV signal scan format countries with the channel bandwidth is not the same, in accordance with the International Radio Consultative Committee (CCIR) to distinguish the recommendations of the Latin alphabet. If M on behalf of 30 frames per second, 525 lines per frame, the video bandwidth of 4.2 MHz, with FM and AM sound with the video below the total residual high-frequency bandwidth is 6 MHz; D, K on behalf of 25 frames per second, each 625-line frame, 6 MHz video bandwidth, high-frequency bandwidth of 8 MHz. All the video baseband television signals are modulated with audio signals to the very high frequency (VHF) or ultrahigh frequency (UHF) band on the radio emission. The international division to television broadcasting in the VHF band have Ⅰ, Ⅲ band, the UHF has Ⅳ, Ⅴ band. TV channel is a
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English Expression
: radiovision, TV television, process of transmitting and reproducing on a screen events, scenes, plays, etc in pictures and sound, using radio signals, video
n.: tv, recording or broadcasting of moving pictures, as distinct from sound, by using television, telly; television, the boob tube, scanning disk, lens louse, pilot film, disc caddy, boob tube, tube, telly, television, docudrama, continuity, clambake, camera, box, airwave
adj.: commercial
vt.: dub
French Expression
n. télévision, TV
Thesaurus
video, image, mirror image, image telecast, Broadcast Television, video recording
college courses broadcast on television