Analogue and Digital Signals

Sound and images can be sent as analogue or digital signals, but digital technology is gradually taking over.

Information is converted into signals

• Information (things like your voice on a phone or the pictures of a TV programme) is converted (changes) into electrical signals before it's transmitted 
• It's then sent long distances down telephone lines or superimposed (mixed) onto EM waves
• It's them sent out as either analogue or digital signals

Analogue signals vary but digital is either on of off

• An analogue signal can vary continuously
• This means it can take any value in a particular range
• Digital signals can only take…