An electric signal is the sending of information by means of an electric circuit. Signals may take a variety of forms, they can be simple or complex, descriptions which change over time as technology develops. Today, audio may be described as a simple signal, yet where it is adapted to fit into, say, a mini-disc player it assumes a complexity far beyond that transmitted into our homes in the early days of wireless.

Video is a complex signal. In whatever form, video will always be complex. It must not only describe the picture but how it is constructed. To understand the video signal, we must go back to the beginning and look at the way a picture is converted into electricity for transmission. Understanding ...

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