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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.

This unit progresses pupils' knowledge and understanding of data representations and compression. They will be introduced to the ASCII and unicode character sets and the limitations of some character sets. Pupils will revisit how images and sound are represented and gain further insight into resulting file sizes and metadata. Pupils will develop awareness of the need to balance quality over file size and will be able to calculate the file size of given image and sound files.

  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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