What is digital television?

cctv.com 11-17-2004 14:05

A Compact Disc stores music as a series of binary digits, i.e. noughts and ones. Digital Television is a television service represented in the same way. Just as CDs improved on vinyl by eliminating scratches, digital television improves on normal (or "analogue") television by eliminating interference such as ghosting.

Another property of digital television is that it can be easily compressed by a computer chip. The advantage of compression is that more TV channels can be squeezed in to the same space (or "bandwidth") that would normally be occupied by a single analogue channel.

So basically Digital TV means more channels and interference-free pictures. But, interference-free pictures aren't necessarily better pictures, as I shall explain, and the more channels you squeeze in, the worse the pictures become...

Source: Andrew Wiseman's Television Room

Editor:Wang  Source: