Unit 2: Data Representation

images
1. vector
  1. images drawn to a formula
  2. rescaleing doesn't damage image quality
2. bitmap
  1. arranged as a grid
  2. resolution shows the number of pixels
  3. image stored as a series of values per pixel
sound
1. digital
  1. sampling
    1. Amount of times the frequency of the sound waves are measured
      1. ranges from 44KHZ to 320KHZ
  2. how the computers read sound
2. analogue
units
1. goes up in mostly multiples of 1024
2. bits-bytes-kilobytes-megabytes-gigabytes-terabytes
Numbers
1. denary
  1. base 10, what we use
2. hexadecimal
  1. base 16
3. binary
  1. base 2
  2. how computers read instruction + data
characters
1. Unicode
  1. 16 bit character set
  2. more space needed
2. ASCII
  1. 7 bit character set
  2. American Standard Code for Information Interchange

Resource summary

	Created by Reasons&Things over 9 years ago