Just bought a sharp lcd-37gx3 LCD TV, do you know what cable is needed to connect with the computer? It's better to be clear, including the type and price of the line (about 15 meters long)
Author:Hao Wandong Time:2021-09-11 13:34 Browse(384)
Different countries adopt different standards.. There's no difference, just different standards...
different countries adopt different standards.
there is no difference, just different standards.
is the same as 3G now.
can also make phone calls.
from Baidu entry.
specific information can be seen! Because it takes a lot of words to explain these three formats.
I'm a bit lazy.
NTSC and SECAM are the three existing analog color TV formats in the world.
the so-called format.
is a technical standard jointly implemented by TV stations and televisions to process video and audio signals, Only when the technical standard is the same, can the signal of TV be accepted normally.
just like the power socket and plug in the home.
the plug in China can't be plugged in the power socket of British standard, only the standard is the same, In order to connect smoothly.
the image display of color TV is composed of red, green and blue primary color signals.
the different brightness of the three color signals constitutes a colorful color picture.
how to process the three primary color signals.
and realize the broadcast and reception needs certain technical standards, At present, there are three kinds of color TV systems with analog technology in the world, namely NTSC system (also known as n system, or American system), PAL system (also known as PAL system, or West German system, or British system), SECAM system (also known as SECAM system, or French system).
there are three kinds of color TV systems with analog technology in the worldThe difference of standards mainly lies in the difference of frame frequency (field frequency), decomposition rate, signal bandwidth and carrier frequency NTSC (National Television System Committee) is the earliest color TV system.
it was formulated by the National Television Standards Committee of the United States in 1952.
it adopts the technology of orthogonal balanced amplitude modulation.
so it is also called orthogonal balanced amplitude modulation.
most western hemisphere countries such as the United States and Canada, as well as China's Taiwan, Japan and Japan South Korea and the Philippines all adopt this system.
its advantages are simple decoding circuit and low cost.
SECAM is the abbreviation of French, which means sequential transmission of color signal and storage recovery of color signal system A color TV system was developed in 1966.
it overcomes the disadvantage of phase distortion of NTSC system.
time division method is used to transmit two color difference signals.
SECAM system is mainly used in France Eastern Europe and the Middle East.
its advantage is that it is least affected by the multipath reception in the transmission.
the color is the best.
pal (phase alternation line) system.
it is a color television broadcasting standard formulated by West Germany in 1962. It adopts the technique of phase inversion orthogonal balanced amplitude modulation, It also overcomes the shortcomings of NTSC system's phase sensitivity resulting in color distortion..
, Western Europe, Britain and some other Western European countries such as.
, Singapore, Chinese mainland and Hongkong, Australia, New Zealand and other countries adopt this standard.
.It is the most successful color TV system, but the TV circuit and broadcasting equipment are more complex.
but the problem is more complicated.
because black and white TV was invented before.
Color TV was invented after, Black and white TV is still broadcasting. New color TV must be compatible with black and white TV signals to have a market. Therefore, when countries began to broadcast color TV, they all thought that they should be able to receive black and white TV signals and play black and white images displayed by color picture tubes, This involves the problem of black-and-white TV system.
in fact, the video part of black-and-white TV only transmits one brightness signal.
the picture is formed by the brightness of different areas.
the main specifications of black-and-white TV system are the modulation mode of image and accompanying sound, the polarity of image signal, the carrier frequency difference of image and accompanying sound, the bandwidth, the channel spacing, the frequency difference between image and accompanying sound At present, there are 13 kinds of black-and-white TV systems in the world, such as a, B, C, D, e, F, G, h, I, K, K1, l, m, N, etc.
among them, a, C, e have not been used, and three color TV systems plus 10 black-and-white TV systems have formed about 39 TV system combinations.
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