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Structure and Relevance
Structure and relevance

Chapter 4 introduced the idea of code structure and distinguished between the internal structure of a code (constraints on the relationship among its elements in a typical message) and its external structure (the relationship of its elements to external events, ideas, and communicative purposes). Chapter 5 will explore the concept of external structure further and link the external structure of a code to the concept of relevance, first introduced in Chapters 1 and 2.

Signal transmission theory explicitly assumes a manufactured signal transmission system. The transmitter and receiver are designed to recognize certain phenomena as signals and ignore the rest. Paul Revere's signaling system established a system in which lights counted as part of the signal if and only if they ...

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