If a signal is defined at all values of *t* where *t* is a continuous variable, this is known as a continuous time signal. Fig. 1.1 is known as continuous time signal.

**Fig. 1.1** Continuous signal

The signal shown in Fig. 1.1 is continuous in time as well as in amplitude. Fig. 1.2 given below shows a signal which is continuous in time but discrete in amplitude.

**Fig. 1.2** Continuous in time but discrete in amplitude

**Example 1.1** Fig. E1.1 shows a continuous-time signal. Sketch and level of the following signals: ...

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