Rural LCD TV signal, the evolution of rural TV signal reception

Now Chinese TVs are all 4:3 signals, LCD TVs are basically 16:9 (non-19; 9), LCD TV can **4:

3 TV shows, but the width is stretched, such as a 16:9 full screen**4:3 program, the characters in the program will be fatter than the actual one.

Therefore, you can use LCD TV** CCTV, and you don't need to do this setting.

Of course, most LCD TVs now also provide the function of adjusting the picture ratio,You can choose16:9or4:3Picture,It's just**4:3There will be 2 black screen bands on both sides of the screen during the program,It may be uncomfortable visually。

Now only the United States is popularizing 16:9 TV programs, and other countries still use 4:3.

Hello Not only in rural areas, but also in big cities, the TV signal is 4:3.

Because now TVs are all 16:9, if you watch 4:3 TV, it will be stretched, and some people are not used to watching it. There should be a set aspect ratio in the TV menu settings,You look for it,Set it to4:3That's it。

However, after changing to 4:3, it will waste a lot of space on the display, and you need to turn it back when watching 16:9 movies.

This is the national condition of our country.

There is a way to get it.

This is the signal source is 4:3.

Summary. Hello, glad for your question. Reception of radio waves The phenomenon of electrical resonance is used to select the desired electromagnetic waves, the conditions under which electrical resonance occurs

F solid f electrical, by adjusting the capacitor c or adjusting the size of the inductance l to achieve the selection, the tuning circuit receives the high-frequency oscillation current carrying the signal through the detection, and then we get the signal we need.

The television station transmits the electrical signals of image and voice to the outside world at the same time through radio waves, and the television sets receive the television signals by adjusting the oscillating natural frequency of the LC circuit to generate electrical resonance. I hope I can help you and have a good life.

The evolution of rural television signal reception has passed.

Hello, glad you asked. Reception of radio waves Use the phenomenon of electrical resonance to select the required electromagnetic waves, the conditions for the occurrence of electrical resonance: f solid f electricity, by adjusting the capacitance c or adjusting the size of the inductance l to achieve the selection of the station, by the tuning circuit to receive the high-frequency oscillation current carrying the signal traces through the detection, we can get the signal we need.

The television station transmits the electrical signals of the image bridge and voice to the outside world at the same time through radio waves, and the television sets receive the television signals by adjusting the oscillating natural frequency of the LC circuit to generate electrical resonance. I hope I can help you and have a good life.

Look at the dear.

China's color TV system stipulates the use of 100% saturation,75% amplitude of the color bar,That is, the use of 100 75 color bar is also named as100-0-75-0 standard color bar signal,In this color bar signal,The maximum and minimum values of the primary color voltage of the black and white bars are still 1 and 0,But the maximum and minimum values of the primary color voltage of the color bar are respectively and0。 This color bar was developed by the European Broadcasting Union (EBU), so it is also called EBU color bar. China's television standards also stipulate the uniform use of this color bar signal in the transmission, transmission and tape recording of television signals.

The data for this color bar signal are listed in Table 2-4 100-0-75-0 color bar signal data. The 100 0 75 0 primary color waveform is shown in Figure 2-4-13, and the 100 0 75 0 negative polarity color bar waveform is shown in Figure 2-4-14.

The image signal and the accompanying sound signal can only be transmitted after modulation and mixing to form an RF all-TV signal.

The sequential sampling, transmission, and reproduction of TV signals from point to surface is done by scanning. The TV scanning system varies from country to country, but in China it is 25 frames per second and 625 lines per frame. Each line is scanned from left to right, and each frame is scanned in two fields from top to bottom in odd lines and even lines to reduce the feeling of flicker.

During the scanning process, the image information is transmitted, and the counter-scan line before the scanning electron beam returns from the end of the previous line to the starting point of the next line, and the field counter-scan line that returns to the top after each field is swept from top to bottom. A line field synchronization signal is transmitted during line field blanking to synchronize the scans of the receiving and receiving fields to accurately reproduce the original image and <>