
Students Guide to Information
Technology
Digital
values
Aoalogue signal
4 h-I
Figure 5.2 Analogue-to-digital conversion
reversing the process shown in Figure 5.2, i.e. drawing a waveform
from a series of plotted points. The waveform will now have the
stepped appearance shown in the figure, but provided the intervals
between each reading are very small (which they are), it will be
virtually indistinguishable from the original.
Examples of devices used for analogue-to-digital conversions or
vice versa include:
# video digitizers to convert the signal from a video camera to
computer input
# scanners to convert an image on paper to computer inpu ...