Whats the difference between an Analogue and Digital Television?
Analog is the old method where each part of the signal is somewhat separate. There is a video carrier on which the video signal is modulated and an audio sub-carrier on which the audio is modulated. The closed captions are hidden in the video. And an extra sub-carrier or two may exist for stereo and secondary audio program. Digital has all these signals encoded in one signal as levels with numeric value. Within the numeric values which digitally represent the video, audio, captions, program description and possibly up to five more sets of the same are numeric identifiers which allow your digital receiver to reconstruct all these signals and convert them back into a TV signal for picture and sound to come from your TV. Because digital can now show multiple programs or one great HDTV program most countries will switch to it to over better pictures and sound and to reduce the number of necessary free over the air broadcast channels.
