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Understanding Digital Television by Lars-Ingemar Lundstrom

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2

What Is Digital TV?

CHAPTER  

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    2.1

Digital TV opens up a world of new possibilities.

TV transmissions contain a lot more information than radio broadcasts. The analog 625 line video signal contains about 250 times more information as a pure audio signal. The fact that a video signal requires this large amount of information has always been a problem for TV distribution.

Unlike an audio signal, the video signal does contain a lot of repeated information, since two consecutive frames of a transmission contain very similar information. This repeated information may be used to decrease the amount of information that has to be ...

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