graphics and sound

• Raster graphics


  One type of digital image that can be stored on a computer

  
• Vector graphics


  One type of digital image that can be stored on a computer

  
• Analogue signal


  Sound is an analogue signal, not digital

  
• Converting analogue signal to digital

  1. Sent to computer system

  2. Converted into digital signal before processing

  
• Sampling


  Process where hardware measures the level of sound many times per second and records this as binary digits

  
• Sampling frequency/Rate


  The number of times the sound level is sampled per second

  
• The higher the sampling frequency, the better the quality of the sound recorded

  
• Metadata


  Information stored in files to describe the contents of the file