Video signals are complicated. A close inspection of a television screen reveals that the picture is comprised of many horizontal lines drawn one after another. The video signal contains the information to draw these lines, detailing whether parts of the line should be dark or light and how to display the colors. Sound is also encoded in the signal.
There are three predominant methods of encoding a video signal: amplitude modulation (AM), frequency modulation (FM) and digital modulation. (See Table 12.1.)
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