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1 CRT
"The basis of the television screen and the standard microcomputer display screen. A CRT display is built around a vacuum tube containing one or more electron guns whose electron beams rapidly sweep horizontally across the inside of the front surface of the tube, which is coated with a material that glows when irradiated. Each electron beam moves from left to right, top to bottom, one horizontal scan line at a time. To keep the screen image from flickering, the electron beam refreshes the screen 30 times or more per second. The clarity of the image is determined by the number of pixels on the screen." -
2 closed captioning
A service or feature that renders the audio content of a television or video program as text on the screen. These captions are usually visible only if decoded or activated. -
3 caption
Descriptive text that represents the audio content of a television or video program as text on the screen. Captions are usually visible only if decoded or activated.
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