1.1 SIGNALS AND SYSTEMS
If a function represents a physical quantity or variable containing the information about the behaviour and nature of the phenomenon, it is known as a signal. Since a function is mathematically represented as a function of an independent variable, it is denoted by x (t). In a R–L circuit, the current through the resistor or voltage across the inductor is called a signal.
On the contrary, a device or a set of rules defining the functional relation between the input and output is known as a system.
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