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Computer Science
AQA GCSE Computer Science
Fundamentals of data representation
AQA GCSE Computer Science · 8525 · 3.3
Fundamentals of data representation
Paper 2
· 37 notes
3.3.1
Number bases
Decimal, Binary, and Hexadecimal
Binary Representation
Purpose of Hexadecimal
3.3.2
Number Base Conversion
Binary Whole Numbers
Hexadecimal Whole Numbers
Bi-directional Base Conversion
3.3.3
Units of information
Bits and Bytes
Byte Prefixes
Decimal Prefix Values
Comparing Byte Quantities
3.3.4
Binary arithmetic
Binary Addition
Binary Shifts
Applications of Binary Shifts
3.3.5
Character encoding
Character Sets and Encoding
Sequential Character Codes
Purpose and Advantages of Unicode
Unicode and ASCII Compatibility
3.3.6
Representing images
Pixels and Image Display
Bitmap Image Properties
Bitmap Image Measurement
Bitmap Representation Mechanics
Pixels, Colour Depth, and File Size
Bitmap File Size Calculation
Binary to Bitmap Conversion
Bitmap to Binary Conversion
3.3.7
Representing sound
Analogue to Digital Sound Conversion
Sound Sampling Process
Sampling Rate and Resolution
Sound File Size Calculation
3.3.8
Data compression
Data Compression Concept
Reasons for Compression
Huffman Coding
Interpreting Huffman Trees
Huffman Compression Calculations
ASCII Storage Calculations
Run Length Encoding (RLE)
Implementing RLE Pairs
Practise with past papers
Key terms & definitions
