Revise GCSE Physics


Question:Why is noise less of a problem on a digital signal?

With a digital signal we do not really care about the exact size of the signal, just whether it is on or off.

So even fairly large amounts of noise do not alter the signal.

The noise would have to be big enough to make an on or off value look like the opposite value before there is a problem.

Angry face

Looking at the example above, the signal is judged to be an &aposon&apos value as long as it is over the threshold value; it takes a lot of noise to push the signal beyond this threshold value and cause a signalling error.