2.3
Data Representation
Binary, hexadecimal, images, sound
Binary: Base 2 (0,1), Hexadecimal: Base 16 (0-9, A-F)
8 bits = 1 byte, can represent 0-255
Two's complement for negative numbers
Character encoding: ASCII (7-bit), Unicode (multi-byte)
Images: Resolution x colour depth = file size
Sound: Sample rate x bit depth x duration = file size
Exam Tips
- •Always define key terms before explaining concepts
- •Use specific examples where possible to demonstrate understanding
- •Check mark allocation - one point per mark is a good guide