The broadcast of a television picture begins with a television camera. Inside most cameras a prison system breaks light from a scene into the three primary colors light red green and blue The colored light falls on image sensors called charged coupled devices or CCDS. When light falls on the CCD it produces a pattern of electric charges the CCD releases these charges line by line producing an electric current called a video signal. The separate video signals are combined by an encoder into a single signal which goes to a transmitter along with any sound or audio. The transmitter produces a television signal from the audio and video signals. This TV signal is broadcasted by an antenna as electromagnetic wave of an assigned frequency range or a channel for that station.
A television antenna picks up all broadcast signal that reach it. These signals produce electric current within the antenna inside the TV the tuner select the desired broadcast signals other parts of the receive separate the audio signal and send it into a speaker system. The video signal is divided into three signal. 14 red, 1 blue and 1 for green. The inside of TV screen is coated with stripes or dots of red, green and blue materials called phosphors and electron gun for each color shoots it. An electron gun for each color shoots an electron beam onto the scene line by line which causes the phosphor to glow the beam strength which is controlled by the video. Signal determines how brightly the phosphorus glow the patterns of life given off by the phosphors duplicate the image recorded by the camera and the viewer sees a picture of the original science