Continuous-time signal:
A signal which is continuous both in time and amplitude iscalled continuous-time signal.
The continuous signal is a mathematical function of independentvariable , where the variablerepresentsa set of real numbers. It is required that signals are uniquelydefined in except for a finite number of points.
For example, consider the continuous-time unit step signal as shown in Figure 1.
Discrete-time signal:
A signal which is continuous in amplitude but discrete in timeis called discrete-time signal.
The discrete signal is a mathematical function of independentvariable,where the variable represents a set of integers. Discrete signals take real or complexvalues as a function of independent variable that ranges over a setof integers and is denoted as.
For example =0,1, 2, 3, 4……..}
For example, consider the discrete-time unit step signal as shown in Figure 2.
Digital signal:
A signal which is discrete both in amplitude and time is calledDigital-signal.
The digital signal represents a sequence of discrete values. Itis used to represent data, the binary bit 1 and bit 0 representspositive and negative values respectively.
For example a logic signal is a digital signal which has twovalues 0 and 1.
For example, consider the digital signal as shown in Figure3.
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