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Learning objective

Error checking and correction: Describe and explain the use of: • parity bits • majority voting • checksums • check digits.

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Topic

Information coding systems

Subtopic

Error checking and correction

Aqa A Level Computer ScienceFundamentals of data representation

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Quick explanation

Error checking and correction: Describe and explain the use of: • parity bits • majority voting • checksums • check digits

  • This point belongs to Information coding systems, especially Error checking and correction.
  • You need to be able to error checking and correction: Describe and explain the use of: • parity bits • majority voting • checksums • check digits.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Why it matters

This objective helps connect Error checking and correction to exam-style questions, flashcards, and revision notes for Information coding systems.

Quick student answer

A system uses even parity. The data bits are 1011001. Which parity bit should be added?

Direct answer

0, because the data already contains an even number of 1s

Key terms

  • Checksum: A value calculated from a block of data and used by comparing the sender's value with a value recalculated by the receiver.
  • Check digit: An additional digit calculated from the other digits in a number or identifier and used for checking.

Common trap

Confusing a checksum with a check digit: A checksum is calculated from a block of data, while a check digit is an additional digit calculated from the other digits in a number or identifier.

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