NTSC is an abbreviation of National Television Systems Committee, which means "National Television Systems Committee Standard".
NTSC is responsible for the development of a set of US standard television broadcast transmission and reception protocols. There are also two sets of standards: progressive inversion (PAL) and sequential color television (SECAM) for other countries in the world. The NTSC standards have not changed much since they were created, in addition to the new parameters of the color signal. NTSC signals are not directly compatible with computer systems.
There are 525 horizontal lines for each frame of the NTSC TV full-screen image. The lines are arranged from left to right and from top to bottom. Every other line is a jump. So every complete frame needs to scan two screens: the first scan is an odd line, and the other scan is an even line. Each half-frame screen scan takes about 1/60 seconds; the entire frame scan takes 1/30 seconds. This interlaced system is also called interlacing (also meaning interlacing). The adapter can convert NTSC signals into digital signals that the computer can recognize. Conversely, there are devices that can convert computer video to NTSC signals and can use television receivers as computer monitors. However, since the resolution of a general-purpose television receiver is lower than that of an ordinary monitor, even if the television screen is large, it cannot adapt to all the computer programs.
In recent years, the industry urgently needs to adopt a new set of television standards. One proposed use protocol is high definition television (HDTV). HDTV standards can be completely compatible with computer systems. However, some design problems still remain unresolved. Some industry experts worry that such compatibility can seriously increase the cost of general-purpose TVs.
The PAL system is a method of color coding in television broadcasting. The full name is Phase Alternating Line. It is the color TV broadcasting standard that West Germany designated in 1962. It adopts the technical method of phase-by-row inversion and balanced amplitude modulation, which overcomes the shortcomings of phase distortion caused by NTSC system. West Germany, the United Kingdom and some Western European countries, Singapore, China and Hong Kong, Australia, New Zealand and other countries adopt this system. PAL was proposed by the German Walter Bruch in 1967 when he worked for Telefunken. "PAL" is also sometimes used to refer to 625 lines, 25 frames per second, interlaced, PAL color-coded television formats. The PAL system can be further divided into G, I, D, etc. according to different parameter details. The PAL-D system is a standard adopted in mainland China.
Common TV signal formats are PAL and NTSC, and SECAM.
NTSC is a quadrature balanced amplitude modulation system. PAL is a line-by-line inverse quadrature balanced amplitude modulation system.
PAL TV Standard
PAL TV standard, 25 frames per second, 625 lines of TV scan lines, odd field first, even field later, standard digital PAL TV standard resolution 720*576, 24-bit color depth, picture width The ratio is 4:3. The PAL TV standard is used in China, Europe and other countries and regions.
NTSC TV Standard
NTSC TV standard, 29.97 frames per second (simplified to 30 frames), 525 lines of television scan lines, even field first, odd field, standard digital NTSC television standard resolution of 720*486, 24-bit color bits In depth, the aspect ratio of the picture is 4:3. NTSC TV standards are used in the United States, Japan and other countries and regions.
The television system refers to the television broadcasting technology standards adopted by a country in accordance with relevant international regulations, specific national conditions and technological capabilities.
The main contents of the black-and-white television system are: the modulation method of the image and audio, the polarity of the image signal, the carrier frequency difference between the image and the audio, the frequency bandwidth, the channel interval, the number of scanning lines, and the like. The black and white television systems currently used in various countries in the world include: A, B, C, D, E, F, G, H, I, K, K1, L, M, and N, and a total of 13 types (including A, C, and E) Has not been adopted), our country is the D, K system.
The color television system was developed on the premise of meeting the technical standards for black-and-white television. In order to realize the compatibility of black and white and color signals, there are three different methods for modulation of subcarriers by chroma encoding, forming three kinds of color television systems; namely NTSC (National Television System Committee) system, PAL (Phase Alternation Line) system and SECAM ( SEquential Couleur Avec Memoire). For the NTSC system, since the frequency of the selected color subcarriers is different, NTSC 4.43 and 3.58 can be divided into two types.
Since the standards of AC power supply are not uniform among countries in the world, the use of interchangeable TVs of different formats will cause various problems and even be impossible to receive. It must be reformed. However, this kind of retrofitting is sometimes not worth the candle. TV broadcasting in each country Both TV and TV production follow an established format (different technical content of black-and-white TV and color TV encoding systems, combined into their own country's specific TV format), so that about 10 formats of black-and-white TVs and color TVs The combination of the three color-coded systems creates a 39-category television system portfolio, and our country adopts the PAL-D/K system.
(1) NTSC: It is a color TV broadcasting standard designated by the National Television Standards Committee in 1953. It adopts a quadrature balanced amplitude modulation technique. It is also called a quadrature balanced amplitude modulation system, which includes balanced modulation and positive modulation. Two types of modulation and modulation, although solving the problem of compatibility between color television and black-and-white television broadcasting, have the disadvantages of phase distortion and color instability. The power supply frequency of the NTSC television is 60 Hz, the field frequency is 60 fields per second, the frame rate is 29.97 frames per second, the resolution is 525 lines, and the image signal bandwidth is 6.2 MHz. The advantage of the NTSC system is that the field frequency is high, the picture is relatively stable, and the flicker is weak, but the definition is slightly lower. The United States, Canada, Taiwan, Japan, South Korea, and the Philippines all use this format.
(2) PAL system: It is a color TV broadcasting standard established by West Germany in 1962. It adopts a technical method of line-by-line inversion and balanced amplitude modulation. One of the two color-difference signals simultaneously transmitted is subjected to a line-by-line inversion, and the other color-difference signal is subjected to a quadrature modulation method. In this way, if phase distortion occurs in the signal transmission process, due to the opposite phase of the signals of the adjacent two lines, they will complement each other, thus effectively overcoming the NTSC color distortion caused by phase distortion. Therefore, the PAL system is not sensitive to phase distortion, the image color error is small, and compatibility with black-and-white television is also good, but the PAL system encoder and decoder are more complex than the NTSC system, the signal processing is also more troublesome, the receiver's cost Also high. The power supply frequency of the PAL system television is 50Hz, the field frequency is 50 fields per second, the frame rate is 25 frames per second, the resolution is 625 lines, and the image signal bandwidth is 4.2, 5.5, 5.6 MHz, respectively. Most Western European countries, Singapore, China and Hong Kong, Australia, New Zealand and other countries adopt this system. The PAL system can be further divided into G, I, D, etc. according to the difference of the sound system, and the PAL-D system is a system adopted in mainland China.
NTSC is responsible for the development of a set of US standard television broadcast transmission and reception protocols. There are also two sets of standards: progressive inversion (PAL) and sequential color television (SECAM) for other countries in the world. The NTSC standards have not changed much since they were created, in addition to the new parameters of the color signal. NTSC signals are not directly compatible with computer systems.
There are 525 horizontal lines for each frame of the NTSC TV full-screen image. The lines are arranged from left to right and from top to bottom. Every other line is a jump. So every complete frame needs to scan two screens: the first scan is an odd line, and the other scan is an even line. Each half-frame screen scan takes about 1/60 seconds; the entire frame scan takes 1/30 seconds. This interlaced system is also called interlacing (also meaning interlacing). The adapter can convert NTSC signals into digital signals that the computer can recognize. Conversely, there are devices that can convert computer video to NTSC signals and can use television receivers as computer monitors. However, since the resolution of a general-purpose television receiver is lower than that of an ordinary monitor, even if the television screen is large, it cannot adapt to all the computer programs.
In recent years, the industry urgently needs to adopt a new set of television standards. One proposed use protocol is high definition television (HDTV). HDTV standards can be completely compatible with computer systems. However, some design problems still remain unresolved. Some industry experts worry that such compatibility can seriously increase the cost of general-purpose TVs.
The PAL system is a method of color coding in television broadcasting. The full name is Phase Alternating Line. It is the color TV broadcasting standard that West Germany designated in 1962. It adopts the technical method of phase-by-row inversion and balanced amplitude modulation, which overcomes the shortcomings of phase distortion caused by NTSC system. West Germany, the United Kingdom and some Western European countries, Singapore, China and Hong Kong, Australia, New Zealand and other countries adopt this system. PAL was proposed by the German Walter Bruch in 1967 when he worked for Telefunken. "PAL" is also sometimes used to refer to 625 lines, 25 frames per second, interlaced, PAL color-coded television formats. The PAL system can be further divided into G, I, D, etc. according to different parameter details. The PAL-D system is a standard adopted in mainland China.
Common TV signal formats are PAL and NTSC, and SECAM.
NTSC is a quadrature balanced amplitude modulation system. PAL is a line-by-line inverse quadrature balanced amplitude modulation system.
PAL TV Standard
PAL TV standard, 25 frames per second, 625 lines of TV scan lines, odd field first, even field later, standard digital PAL TV standard resolution 720*576, 24-bit color depth, picture width The ratio is 4:3. The PAL TV standard is used in China, Europe and other countries and regions.
NTSC TV Standard
NTSC TV standard, 29.97 frames per second (simplified to 30 frames), 525 lines of television scan lines, even field first, odd field, standard digital NTSC television standard resolution of 720*486, 24-bit color bits In depth, the aspect ratio of the picture is 4:3. NTSC TV standards are used in the United States, Japan and other countries and regions.
The television system refers to the television broadcasting technology standards adopted by a country in accordance with relevant international regulations, specific national conditions and technological capabilities.
The main contents of the black-and-white television system are: the modulation method of the image and audio, the polarity of the image signal, the carrier frequency difference between the image and the audio, the frequency bandwidth, the channel interval, the number of scanning lines, and the like. The black and white television systems currently used in various countries in the world include: A, B, C, D, E, F, G, H, I, K, K1, L, M, and N, and a total of 13 types (including A, C, and E) Has not been adopted), our country is the D, K system.
The color television system was developed on the premise of meeting the technical standards for black-and-white television. In order to realize the compatibility of black and white and color signals, there are three different methods for modulation of subcarriers by chroma encoding, forming three kinds of color television systems; namely NTSC (National Television System Committee) system, PAL (Phase Alternation Line) system and SECAM ( SEquential Couleur Avec Memoire). For the NTSC system, since the frequency of the selected color subcarriers is different, NTSC 4.43 and 3.58 can be divided into two types.
Since the standards of AC power supply are not uniform among countries in the world, the use of interchangeable TVs of different formats will cause various problems and even be impossible to receive. It must be reformed. However, this kind of retrofitting is sometimes not worth the candle. TV broadcasting in each country Both TV and TV production follow an established format (different technical content of black-and-white TV and color TV encoding systems, combined into their own country's specific TV format), so that about 10 formats of black-and-white TVs and color TVs The combination of the three color-coded systems creates a 39-category television system portfolio, and our country adopts the PAL-D/K system.
(1) NTSC: It is a color TV broadcasting standard designated by the National Television Standards Committee in 1953. It adopts a quadrature balanced amplitude modulation technique. It is also called a quadrature balanced amplitude modulation system, which includes balanced modulation and positive modulation. Two types of modulation and modulation, although solving the problem of compatibility between color television and black-and-white television broadcasting, have the disadvantages of phase distortion and color instability. The power supply frequency of the NTSC television is 60 Hz, the field frequency is 60 fields per second, the frame rate is 29.97 frames per second, the resolution is 525 lines, and the image signal bandwidth is 6.2 MHz. The advantage of the NTSC system is that the field frequency is high, the picture is relatively stable, and the flicker is weak, but the definition is slightly lower. The United States, Canada, Taiwan, Japan, South Korea, and the Philippines all use this format.
(2) PAL system: It is a color TV broadcasting standard established by West Germany in 1962. It adopts a technical method of line-by-line inversion and balanced amplitude modulation. One of the two color-difference signals simultaneously transmitted is subjected to a line-by-line inversion, and the other color-difference signal is subjected to a quadrature modulation method. In this way, if phase distortion occurs in the signal transmission process, due to the opposite phase of the signals of the adjacent two lines, they will complement each other, thus effectively overcoming the NTSC color distortion caused by phase distortion. Therefore, the PAL system is not sensitive to phase distortion, the image color error is small, and compatibility with black-and-white television is also good, but the PAL system encoder and decoder are more complex than the NTSC system, the signal processing is also more troublesome, the receiver's cost Also high. The power supply frequency of the PAL system television is 50Hz, the field frequency is 50 fields per second, the frame rate is 25 frames per second, the resolution is 625 lines, and the image signal bandwidth is 4.2, 5.5, 5.6 MHz, respectively. Most Western European countries, Singapore, China and Hong Kong, Australia, New Zealand and other countries adopt this system. The PAL system can be further divided into G, I, D, etc. according to the difference of the sound system, and the PAL-D system is a system adopted in mainland China.
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