Chapter 4

Source Coding and Decoding

Making it Digital

This chapter talks about how to turn an analog signal into a digital one, a process called source coding. We took a brief look at it at the end of Chapter 1, when Monica’s analog speech signal was turned into a digital signal. We’ll now talk at some length about source coding.

Before going on, just a brief reminder about why we want to turn analog signals to digital. So many naturally occurring sources of information are analog (human speech, for example), and we want to make them digital signals so we can use a digital communication system.

4.1 Sampling

The key first step in turning any analog signal to a digital one is called sampling. Sampling is the changing of an analog signal to samples ...

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