Representation of text, images and sound
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Why this why now
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.
Prior knowledge requirements
- Pupils can describe why computers use binary digits to store data and instructions.
- Pupils know that multiples of data can be abbreviated using number prefixes.
- Pupils recognise that text, images and sound data are represented by sequencies of binary digits.
- Pupils understand that text, images and sounds have properties that can be changed.
Threads
Why this why now
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.
Prior knowledge requirements
- Pupils can describe why computers use binary digits to store data and instructions.
- Pupils know that multiples of data can be abbreviated using number prefixes.
- Pupils recognise that text, images and sound data are represented by sequencies of binary digits.
- Pupils understand that text, images and sounds have properties that can be changed.
Representation of text, images and sound
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.
7 lessons in unit
slide decks, worksheet PDFs, quizzes and lesson overviews. You can select individual lessons from the Representation of text, images and sound unit and download the resources you need, or download the entire unit now. See every unit listed in our AQA secondary computer science curriculum and discover more of our teaching resources for AQA secondary computer science programmes.