The Picture Tube, or CRT

To reproduce the picture at the receiver (the television set) a picture tube (or CATHODE RAY TUBE-CRT) is employed which also contains an electron beam focused on a screen. The Picture tube screen has a uniform coating of a material which emits light when struck by the beam, and if the beam density is controlled by the picture signal from the camera, an reproduction of the original scene is built up on the picture tube screen. Complete pictures are received at the rate of 25 per second and hence movement is the original scene is portrayed as effectively as in the movies.

[ Home | History | HDTV | DSS | V-Chip | SCEN167 ]