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OCR (KS4)

KS3 & KS4 computing curriculum

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Computer Science
Year 10

Representation of text, images and sound

8 lessons

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  • Data and information

Description

In this unit, pupils will discover how letters, images and sounds are represented with binary digits. They will also explore the factors that impact the quality of those representations and investigate the effects these quality choices have on file size.

As pupils’ understanding of how digital data is represented develops, they are ready to explore how computers store and manage different types of information. This unit helps pupils understand how text, images and sound are encoded, revealing how binary underpins digital media. By examining character sets and file compression, pupils begin to recognise the trade-offs between quality, file size and efficiency. Learning this now helps them appreciate the design choices that allow technology to balance performance, accessibility and user experience in the digital world.

  1. Representation using binary sequences
  2. Representing text using ASCII and Unicode
  3. Text file size calculation
  4. Representing bitmap images
  5. Bitmap file size calculation
  6. Representation of sound
  7. Calculation of sound file sizes
  8. Metadata
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