|Respective block from left ||Analog||Digital|
The digital technology has not only changed the electrical engineering. If you take into consideration that all computers can only
function with digital technology and that also almost all data transfers are digitised, you might be able to grasp its importance.
How it works
The difference between analogue and digital technology is explained with the help of an example: an easy conversion from analogue into digital. In the figure on top to the left the analogous signal of one time interval
transmits the values '2', '7', '9' and '10'. The digital signal in the right diagram displays the same information in a 8-bit resolution, the uppermost bit first, because of the lighter legibility. At '1' the tension rises in the first
8-bit block only once briefly and thereby signals the fact that the first bit - the starting point is "0"- is put.
Thus all values are transferred bit by bit digitally. However, the expenditure and the fastness which are typical for a digital transmission, become clear. The transferred tension is nearly uninteresting. For this example
we accept with 'low' lower than 1.5 volts and with 'high' more than 3.5 volts, however, other borders can be agreed upon also. Anyway this system is quite insensitively in respect of annoying influences. If e.g., a
magnetic field causes an average drop of the tension of around 1 volt, the values '1 ', ' 6 ', ' 8 and '9' will be transferred with the analogous signal. The digital signal does not change. 05/08