Difficulty: Easy
Correct Answer: a code in which each expression conforms to specific construction rules so that if certain errors occur, the resulting expression will not conform and the error is detected
Explanation:
Introduction / Context:
Communication systems add redundancy to detect (and sometimes correct) errors introduced by noise, interference, or synchronization problems. Understanding the general definition of an error-detecting code helps categorize specific techniques such as parity, checksums, and cyclic redundancy checks (CRCs).
Given Data / Assumptions:
Concept / Approach:
An error-detecting code imposes structured redundancy so that only a subset of bit patterns are valid. If transmission errors occur, the received pattern will usually violate the structure, enabling detection. This conceptual description is broader than any single method and therefore is the best definition among the choices presented.
Step-by-Step Solution:
Verification / Alternative check:
CRCs, for example, accept only patterns whose polynomial division leaves a specific remainder; any other remainder signals an error, matching the ‘‘rules of construction’’ idea in the correct option.
Why Other Options Are Wrong:
Common Pitfalls:
Treating one technique as the definition; confusing performance metrics with coding methods.
Final Answer:
a code constrained by rules so invalid patterns flag errors (option c).
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