The first television transmission of a moving image consisting of different shades of black and white, can be considered as the experience of the Scottish engineer John Baird that he made 30 October 1925 in his workshop on Frith street in London.
The first electronic television, high-resolution (frequency tubes more than 100) have developed a research group EMI. It has led emigrated from Russia Isaac Schoenberg. This system was demonstrated on December 6, 1932. 130-line TV set (screen 5x5 inches) showed a small film about the changing of the guard at Buckingham Palace. Isaac Schoenberg was able to solve the problem of electronic overlay image. Demonstrating in 1934 camera type "Emitron", he joked: "gentlemen, we invented the big time-eater".
The first color TV program was implemented July 3, 1928 again John Baird, who showed with his station in London red and blue scarves, police helmet, a man with his tongue hanging out and a bouquet of red roses.
Picture image reproduced by the device Byrd
Today, transmission of TV programs is as follows. Cameras installed in the Studio, perceive light images of people and objects, decompose the light in the primary colors (red, green, blue) and converted into electrical signals, which, in turn, is converted into radio waves. Them and emits a transmitting device. The antenna picks up radio waves, turns them into electronicaly.
The main element of a television cathode ray tube (TV screen), the image which is created by electron beam forming the on-screen scan, moving down line by line. It happens so quickly that the eye almost doesn't notice the movement of the beam. In color television sets typically used three primary electron beam (red, green, and blue colors). In the tube there is a phosphorescent compound. Electron beam, falling on them, causing them to glow. Where each type of phosphorescent substances glows its color (red, green or blue). Mixing these colors form a colorful palette of television.
If TV broadcasts using electronicaly transmitted via a special cable, it is included in the cable television system.
Satellite TV allows you to watch TV from anywhere in the world. TV shows converted to microwaves and sent to the orbital satellite. The satellite reflects their own antennas and sends it to the special devices for receiving signals from satellites in different points of the globe.