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Fiber Optic Reference Guide, 3rd Edition by David Goff

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12 VIDEO OVER FIBER

 

 

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.

METHODS OF ENCODING VIDEO SIGNALS

There are three predominant methods of encoding a video signal: amplitude modulation (AM), frequency modulation (FM) and digital modulation. (See Table 12.1.)

Table 12.1: Comparison of AM, FM and Digital Encoding Techniques
Prameter AM FM Digital
Signal-to-Noise Ratio Low-Moderate Moderate-High High
Performance vs. Attenuation ...

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