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test-aqa's Introduction

AQA CS AS Notes

3.5 Fundamentals of data representation

3.5.1 Number systems

  • natural numbers

definition:

examples:

this is an area for code or examples etc

Counting uses natural number
A set of natural number can expressed as:
N={0,1,2,3...}
  • integer numbers
  • rational numbers
  • irrational numbers
  • real numbers
  • ordinal numbers

3.5.2 Number bases

  • base 2
  • base 10
  • base 16

3.5.3 Units of information

  • bit and bytes
  • units of kilo, kilbi etc

3.5.4 Binary number system

unsigned binary

unsigned binary arithmetics

signed binary with two's complement

fixed point form binary representation of numbers with fractional parts

3.5.5 Information encoding system

Character form of a decimal digit

ASCII and Unicode

Error checking and correction

3.5.6 Representing images, sound and other data

Bit patterns, images, sound and other data

Analogue and digital

Analogue and digital conversion

Bitmapped graphics

Digital representation of sound

Musical Instrument Digital Interface (MIDI)

Data compression

Encryption

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