Unit 1 Digital Data: Images, Sound and Portability
Bitmap and vector images, resolution, sound sampling, analogue conversion, compression, streaming and portable file formats.
How to study for CCEA GCSE Digital Technology
Connect precise digital concepts to scenario evidence, design decisions, testing and evaluation, then rehearse the controlled-practice lifecycle under your centre's current CCEA instructions.
Core concepts
Concept 1
Bitmap images store pixels while vector graphics store geometric descriptions, producing different scaling and file-size behaviour.
Exam cue: Connect an image or sound setting to both quality and storage or transfer cost.
Concept 2
Sample rate and bit depth affect digital sound quality and file size because analogue sound must be measured and encoded.
Exam cue: Choose bitmap or vector from the content, editing and scaling requirement.
Concept 3
Compression, buffering, streaming and standard file formats balance portability, compatibility, quality and transfer demand.
Exam cue: Distinguish downloading a complete file from buffering enough data for continuous streamed playback.
Risk pitfalls and guardrails
Claiming vector graphics are stored as a fixed grid of pixels.
Guardrail: Keep to Northern Ireland CCEA scope, never add the weights of both routes, and distinguish a digital concept from unsupported product or technology claims.
Saying a higher sample rate reduces file size while improving quality.
Guardrail: Keep to Northern Ireland CCEA scope, never add the weights of both routes, and distinguish a digital concept from unsupported product or technology claims.
Treating every listed file format as suitable for every media type.
Guardrail: Keep to Northern Ireland CCEA scope, never add the weights of both routes, and distinguish a digital concept from unsupported product or technology claims.
Memory anchors
Pixel
The smallest addressable picture element in a bitmap image.
Resolution
The amount of image detail represented by the pixel dimensions.
Vector graphic
An image stored as mathematical objects and properties.
Sample rate
The number of sound measurements taken per second.
Bit depth
The number of bits used to represent each sound sample.
Compression
Encoding data so it needs less storage or transfer capacity.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which image representation stores a grid of coloured pixels?
Which format is most suitable for a logo that must scale cleanly?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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