Signals are broadly classified into two types: (1) Continuous-time signals (analog signals) and (2) Discrete-time signals (digital signals).
Continuous-time signals (analog signals): These signals are defined for every instant of time and take on values in the continuous interval (x, y), where x and y can be ∞. For example,
|x(t) = sin wt||where −π ≤ wt ≤ π|
Here, wt can assume infinite number of values in the time interval indicated.
The plot is shown in Figure 15.1.
Discrete-time signals (digital signals): The discrete-time signals ...