When was television invented and when was television invented

Television is not the invention of any one person. She is the result of a large group of people in different historical periods and countries. As early as the 19th century, people began to discuss and explore ways to convert images into electronic signals.

In 1900, "television"The term has already appeared. The image of a puppet "scanned" by Scotsman John Logie Baird in London on October 2, 1925, is often seen as the mark of the birth of television, and he is known as the "father of television". However, this perception is controversial.

Because, also in that year, the American Vladimir Zworykin showed his boss his television system at Westinghouse. Despite the same time, John Logie Baird's television systems were very different from those of Vladimir Zworykin. John Logie Baird's television system has been referred to as a mechanical television, while Sfrocking's system has been called an electronic television.

This difference is mainly due to the difference in the principle of transmission and reception.

Television was invented by John Bird of England in 1925.

1925 year.

Television was first invented in 1925 by British engineer John Logie Baird. Television uses electricity to transmit visual images of the event in real time. Similar to movies, TV uses the visual residual effect of the human eye to show a still image with a gradual change of frames, forming a visual living image.

The transmitter of the TV system converts the various fine parts of the scene into electrical signals according to brightness and chromaticity, and transmits them sequentially. At the receiving end, the luminance and chromaticity of each fine part are displayed according to the corresponding geometric position to reproduce the entire original image.

1924 year. The Englishman Baird invented the most primitive television set, which transmitted images with electricity. The RCA launched the world's first black-and-white television in 1939, set the national standard for color television in 1953, and launched the RCA color television in 1954. <

1924 year. The Englishman Baird invented the most primitive television set, which transmitted images with electricity. The RCA launched the world's first black-and-white television in 1939, set the national standard for color television in 1953, and launched the RCA color television in 1954.

The birth of television was one of the greatest inventions of the 20th century. In 1900, the word television first appeared.

British scientist John? Logie? Baird has always been committed to the transmission of television images by mechanical scanning.

On October 2, 1925, he finally built the first mechanical television that could transmit images, and this was the prototype of television. Despite the blurry faces and loud noises of the puppets, the fact that the images come to life in a black box that does not look old has aroused a great deal of interest. The new TV was called the "magic box".

In 1928, Baird developed the first color television.

In 1930, his system began trial audio television programs. The trial broadcast of sound television has made the ancient fable of "show talent don't go out, can know the world" into reality. Baird is also known as the "father of Yuzakura TV".

1. Inventor:

In 1924, the Englishman Baird invented the most primitive television set, which transmitted images with electricity.

US RCA1939

The world's first black-and-white television set was launched in 1953

set the national standard for color TVs as well.

Launched in the year. rca

Color television.

2. How it works:

Because the RF signal is mixed with some interference signals in the process of air transmission and attenuated with the increase of transmission distance, after the TV receives the weak RF TV signal from the cable or antenna (RF IN), it must first be demodulated through the tuner, and after amplification, mixing and detection, the high-frequency carrier component is filtered out to obtain a composite all-TV signal of PAL, NTSC or SECAM standard.

The signal is amplified, and the luminance and chromaticity signals are separated to obtain the YC component signal. Finally, the YC fractional tantan signal was converted into YUV, and then converted into RGB component signal and sent to the CRT for display.

In the whole TV signal, due to the bandwidth occupied by the chromaticity signal, the electronic circuit of the TV directly intercepts the signal at the low end of the brightness of about 3MHz when the brightness and chromaticity signal are separated and processed. In this case, although the phosphor screen of the TV can achieve a horizontal decomposition rate of about 500 lines, the actual horizontal decomposition rate of the TV signal input from the antenna is only about 260 lines. In addition, the strength of the signal of different channels is different, and the final image resolution rate reflected on the phosphor screen is also different.

Television was invented on October 2, 1925. Television is not the invention of any one person, it is the result of a large group of people in different historical periods and countries. As early as the 19th century, people began to discuss and explore ways to convert images into electronic signals.

In 1900, the word "television" had already appeared. The image of a puppet "scanned" by Scotsman John Logge Baird in London on October 2, 1925 is often seen as a sign of the birth of television, and he is known as the "father of television".

In 1979, the world's first "cable television" was launched in London. It was invented by the British Post Office. It can transmit the information in the computer through the ordinary ** line and display it on the user's TV screen.

TVs are roughly divided into 5 subcategories from the use effect and shape: flat-screen TV (plasma, LCD and some ultra-thin wall-mounted DLP rear projection), CRT picture tube TV (flat 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, 3D TV.