A television, or TV, is an electronic system that transforms visual images with sound into electrical signals and displays them on a screen. TVs are vital forms of communication that provide news and entertainment to people all around the world.
How Do Televisions Work?
The tiny light dots on the TV screen, called pixels, flash according to a pattern transmitted by the video signal. The TV shows several tiny dots on the screen. When viewed as a whole, they appear like a picture. Old or new, most televisions work by the same principle.
The viewer’s eyes see the image, and the brain rearranges and interprets it as recognizable. The TV refreshes these patterns quicker than the human eye, which creates the illusion of a moving picture or video. The camera’s microphone transforms the electrical signal into an audio signal. Together, the video and audio signal constitutes the TV signal.
How Does a TV Signal Reach the TV Set?
A TV signal can reach the TV set through several media like antennas, cables, and satellites. Television stations release the shows that viewers watch through electromagnetic signals. Transmitters are set at high points to pick up and convert these signals into radio waves effectively.
A television antenna is an aerial that picks up over-the-air electromagnetic signals from television stations and broadcasts them on the TV through channels. Satellite televisions use signals from satellite dishes, usually mounted on the roof. In the case of cable TV, the signals are transmitted through a coaxial or fiber optic cable.
There is less compression with over-the-air signals, so antennas provide a clearer HDTV picture than satellites and cables. Conversely, the latter options compress the signal to cram and provide more channels to viewers.
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