Computer science SLR3

• lossless compression

  a data compression algorithm that allows the original data to be perfectly reconstructed from the compressed data.
• lossy compression

  data compression techniques in which some amount of data is lost. This technique attempts to eliminate unnecessary information.
• data compression

  Reducing the amount of space needed to store a piece of data
• Sample bit depth

  Number of bits available to store each sample
• Sample interval

  The time between each sample.
• sampling rate

  the number of samples taken per second when sound is recorded
• How sound can be sampled and stored in digital form

  analogue converted to digital then soundwaves
• sound sample

  A measure of amplitude at a point in time
• file size calculation

  colour depth x width x height
• colour depth

  the number of bits used for each pixel in an image file
• tebibyte

  2^40 bytes
• gibibyte

  2^30 bytes
• mebibyte

  1,048,576 bytes (2^20)
• kibibyte

  1024 bytes (2^10)
• byte

  8 bits
• nibble

  4 bits
• bit


  A contraction of "Binary Digit". A bit is the single unit of information in a computer, typically represented as a 0 or 1.
• two's complement

  A method of representing negative numbers in the binary system.
• Hexadecimal

  A base-16 number system that uses sixteen distinct symbols 0-9 and A-F to represent numbers from 0 to 15.
• character set

  A list of the characters and the codes used to represent each one