Data Rep Flashcards
Binary
A base 2 number system that uses the digits only 0 and 1
Bit
A single binary digit, a 0 or a 1
Why Binary
Computers consist of transistors which can have 2 states on or off. Binary represents these two states 0 for off and 1 for on
Hexadecimal
A base 16 number system that uses the digits 0-9 and the letters A-F to represent the digits 10-15
ASCII
The American Standard Code for Information Interchange is an agreed standard for recording characters as pre-specified binary numbers
Character set
A character set is used to describe the possible characters that can be represented in a computer system like ASCII and Unicode
Standard ASCII
ASCII that uses 7 bits to represent 128 characters
Extended ASCII
ASCII that uses 8 bits to represent 256 characters
Unicode
A character set developed for every language in the world using two bytes to store 2^16 possible characters but can be extend to 3 or 4 bytes making it possible to store 2^24 possible characters or 2^32 possible character respectively
Pixel
Small dots that make up a bitmap image
Resolution
The number of pixels per square inch measured in dpi
Colour Depth
The number of bits available for colours in an image
Metadata
Data about the properties of data
Sample
A digitally recorded fragment of sound that is taken from an existing track or environment
Sample rate
The number of audio samples taken per second
Sample size
The number of bits available for an audio sample
Bit rate
Number of bits processed per second
Compression
Process of making a file smaller
Lossy compression
Permanently removing parts of the data to make a file smaller usually used for audio, image and video files
Lossless compression
A form of compression that makes the file smaller without losing data
Operator
A special symbol that carries out a function
Operand
Second part of the opcode that is manipulated by the CPU according to the operator
Check Digit
An extra value at the end of data to confirm that data has been scanned correctly
