Keywords 1 - Data Representation Flashcards
Data
Numbers, symbols or alphanumeric characters in their raw format before processing
Analogue
The smooth stream of data that our senses process on a daily basis, such as a sound wave
Digital
Data represented in the values 1 and 0 that a computer can process
Denary
A system of number with a base of 10. Each unit used increases by the power of 10.
Binary
A system of number with a base of 2. Each unit used increases by the power of 2.
Register
A small piece of memory where values can be held
Hexadecimal
A system of number with a base of 16. Each unit used increases by the power of 16.
Debug
Finding and fixing errors and problems in a program
Bit
Short for Binary digIT, this is the smallest unit of data in a computer (0 or 1)
Byte (B)
8 bits
Kilobyte (KB)
1024 bytes
Megabyte (MB)
1024 KB
Gigabyte (GB)
1024 MB
Terabyte (TB)
1024 GB
Petabyte (PB)
1024 TB
Character
Text, numbers and symbols, for example each key on a keyboard
ASCII
8 bit system to represent characters in memory (max 256 characters)
Unicode
16 bit system to represent characters in memory (max 65,536 characters)
Pixel
A single dot on an image
Metadata (images)
Tells the computer information about the image, such as its resolution
Resolution
The size of an image in pixels, with width and height
Sampling
Digital sound is recorded at set timed intervals by taking a sample of the sound, measured in Hertz
Hertz
The sample rate; 1 hertz = 1 sample per second
Data compression
The bit structure of a file is manipulated to reduce the file size
Algorithm
A step-by-step set of instructions
Lossy compression
Data deemed unnecessary is permanently removed during file compression (Lossy)
Lossless compression
A compression method in which no data is lost (Lossless)
