The Greek word 'Tele' means the distance, and the Latin word 'Vision' means the meaning. It was possible to send the first fixed picture through wire in 1862. Then in 1873 scientists discovered the method of sending photos through May and Smith Electronic Signal. The British scientist John Logie Baird discovered the first television in 1926 and was able to send white black images away to the electronic broadcast. The BBC started its first television broadcast in 1936 after the achievement of Russian origin engineer Isaac Shweinbarg. The television was launched commercially in 1940. In 1945, the machine became full. After World War II, significant changes in television were noticed. In the 50s of the last century, television came into the role of the media.
The main idea of television is to transmit sound and image pattern through radio waves. Originally made of three technologies, the output of the television: the TV camera whose work is converting the word and image into electro-magnetic signal, the transmitter of which is the function of transmitting this signal via wireless waves and the TV set (receiver) whose job is to accept this signal Converting to previous pictures and words. Typically camera images can be divided into two parts: still pictures and moving pictures. The movie / video cameras are used for general cameras and movies for the pictures. Actually many films are formed in combination with the pictures. The video camera accepts many pictures (24 pic / sec or more) at a rapid pace. When these pictures are displayed consistently at the same speed, they are considered to be movies in our eyes. In this frame, it is not easy to change the image of this picture. These scenes can be identified separately if they see the film very slow. Analog TV camera usually sends pixels of these pictures to 525 lines and sends the line by line via radio waves. Simultaneously, the sound waves transmit through a different signal. Photographs and sound signal transmitted to the picture and the sound by taking the TV with antenna / cable / satellite in special way. The ray gamma emitted from the retrieval.
Television can be divided into different ways depending on the display or display technology. For example: CRT, Plasma, LCD, LED, etc. Until the broadcast from the broadcast, the entire television footage can be divided into three groups: analog television (traditional method), digital television (DTV) and HDTV.
Analog or traditional TV system ie TV camera, transmitting system and TVSet all work in analog method. The PAL standard image pixel on this type of TV is only (720 × 576) 414,720 and the photo aspect ratio 4: 3, which means the picture size of the screen is 4 single wide and 3 singles high. That means, 20 × 15 inches on the 25-inch diagonal TV screen.
