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Learning objective

Comprehend the methods and reasons behind how computers represent text, including the use of character sets like ASCII and Unicode. Notes: • Text is transformed into binary for computer processing. • Unicode supports a wider variety of characters and symbols compared to ASCII, accommodating multiple languages and emojis. • Unicode requires more bits per character than ASCII.

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Cambridge IGCSE Computer ScienceData representation

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Quick explanation

Comprehend the methods and reasons behind how computers represent text, including the use of character sets like ASCII and Unicode. Notes: • Text is transformed into binary for computer processing. • Unicode supports a wider variety of characters and symbols compared to ASCII, accommodating multiple languages and emojis. • Unicode requires more bits per character than ASCII

  • This point belongs to Text, sound and images, especially Text, sound and images outcomes.
  • You need to be able to comprehend the methods and reasons behind how computers represent text, including the use of character sets like ASCII and Unicode. Notes: • Text is transformed into binary for computer processing. • Unicode supports a wider variety of characters and symbols compared to ASCII, accommodating multiple languages and emojis. • Unicode requires more bits per character than ASCII.
  • The key ideas to know are Understand, Explain, and Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

UnderstandExplainDescribe

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This objective helps connect Text, sound and images outcomes to exam-style questions, flashcards, and revision notes for Text, sound and images.

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Paper 1 structured question: Text, sound and images

Paper 1Computer Systems1 marks

Description

Character Encoding

Character encoding is the method used to represent text in computers. ASCII and Unicode are two common character sets used for this purpose.

  1. a

    State the main difference between ASCII and Unicode.

    Aim for approximately 1 distinct marking point.

    [1]
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