The TV receives and translates electromagnetic waves into picture information.
Radio waves are transmitted from a location and are intercepted by the TV's ANTENNA. All signals received by the antenna go to the tuner. The TUNER selectively picks out a single channel or frequency and sends the signal to the VIDEO, AUDIO and SCANNING portion of the circuits.
The SCANNING section scans an electron beam across the screen. The TV picture is actually made up of many lines scanned one by one. As the electron beam scans across the screen the VIDEO section varies the intensity of the beam. A complete picture is scanned on the TV screen 30 times per second. Look closely at the TV screen and you will see thousands of tiny color dots that create the picture.
Audio information is transmitted with the video signal. At the same time that the Video information is processed, Audio information is sent to the amplifiers and speaker of the TV.
There's More!
The first scanning television was demonstrated at the Franklin Institute (one of the first science centers) in Philadelphia in 1928. The system was invented by Philo Farnsworth. In order to be paid for the work he was doing, Farnsworth needed his mother's permission - he was not yet 21!
