data storage

• ascii:

  • character set
  • a 7 bit code
  • 128 character combinations (2^7)
  • the american standard code for information interchange
• binary shift:

  • moving the bit pattern in a register left or right in a given number of positions
  • shifting right by 1 divides by 2
  • shifting left by 1 multiplies by 2
• character set:

  • defined list of characters recognised by the computer hardware and software
  • each character is represented by a number
• color depth:

  • the number of bits used to store a single pixel
• denary:

  • a numerical system of notation
  • base 10
• hexadecimal:

  • numerical system of notation
  • base 16
• image quality:

  • the detail of an image determined by the color depth and resolution
• metadata:

  • additional data stored with a file that describes the data in the file
  • data about data
• overflow:

  • when there are insufficient bits to store a number after a calculation due to a final carry bit
• pixel:

  • single dot of colour in a bitmap image or on a computer screen
• playback quality:

  • finished quality of the digital sound file
  • affected by the sample rate and bit-depth
• resolution:

  • number of pixels contained on a display monitor / image
  • expressed in terms of the number of pixels on the horizontal and vertical axis
• sampling rate:

  • number of samples per second
  • rate at which samples of an analogue signal are taken in order to be converted into digital form
• sound file size:

  • the physical storage size of a sound file
• unicode:

  • a character set
  • stores characters from all the world languages including ancient languages
  • stores emojis.