A signal is a physical pattern carrying distinctions through a system, such as sound, light, or electrical variation. Its detection and faithful transmission differ from interpretation. An intact signal can carry a message that is misunderstood, so signal quality and understanding require separate examination.
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Key concept
Key concepts are the working vocabulary of the field: the terms that the models and tools rely on and that a decision about communication has to use precisely. Each entry defines the term and sends you to the brief or the self-guided audit where it is put to work.