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In the previous chapters, we considered the problem of digital transmission over different channels. Information sources arenot often digital, and in fact, many sources are analog. Although many channels are also analog, it is still moreefficient to convert analog sources into digital data and transmit over analog channels using digital transmissiontechniques. There are two reasons why digital transmission could be more efficient and more reliable than analogtransmission:
The information content of the following sentences: "Hello, hello, hello." and "There is an exam today." are not thesame. Clearly the second one carries more information. The first one can be compressed to "Hello" without much loss ofinformation.
In other modules, we will quantify information and find efficient representation of information ( Entropy ). We will also quantify how much information can be transmitted through channels, reliably. Channel coding can be used to reduce information rate and increase reliability.
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