Background
Coding Theory is the branch of mathematics that covers source codes and channel codes.
A channel code contains redundancy to allow more reliable communication in the presence of noise. This redundancy means that only a limited set of signals is allowed: this set is the code.
A source code is used to compress words (or phrases or data) by mapping common words into shorter words.
Procedure words are used for voice communication on noisy channels.
Read more about this topic: Code Word
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