Digital representing of quantities

 Digital representing of quantities

Digital quantities unlike Analogue quantities are not continuous but represent quantities

measured at discrete intervals. Consider the continuous signal as shown in the figure 1.1.

To represent this signal digitally the signal is sampled at fixed and equal intervals. 

The continuous signal is sampled at 15 fixed and equal intervals. Figure 1.2. The set of values (1,

2, 4, 7, 18, 34, 25, 23, 35, 37, 29, 42, 41, 25 and 22) measured at the sampling points

represent the continuous signal. The 15 samples do not exactly represent the original signal

but only approximate the original continuous signal. This can be confirmed by plotting the 15

sample points. Figure 1.3. The reconstructed signal from the 15 samples has sharp corners

and edges in contrast to the original signal that has smooth curves.