Cable Television
Television and Video
Broadcast Television

How does a television work?



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Televisions are complex devices and are the result of a century of invention and development. However, the principles remain the same and are very simple. A picture is captured by a camera by breaking the image into a series of dots or pixels across the width of the picture. Each string of dots makes up one line of the image. In an HD signal, there are 1920 dots in each line and 1080 lines from top to bottom. As each dot is captured, the amount of red, green and blue light is recorded as three numbers. These numbers are sent as a continuous stream of data. When the whole image has been sent, the whole process starts over to deliver the next image. The images are captured 25 or 30 times every second. The television receives the stream of data and decodes it into a brightness for each of the three colors in every pixel. There are many other processes that go on alongside this process but the description shows the main principle - Identical to the one used by John Logie Baird in 1925.
A television works by sending and receiving electronic signals.