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Signals are functions

Module by: Richard Baraniuk

A signal is a function that maps an independent variable into a dependent variable. The function f(x), for each value of x, produces the value f(x)

Figure 1
Figure 1 (1fig1.png)
There are four ways to classify signals according to the values that the independent and dependent variables can take. Refer to the table below.
Figure 2
Figure 2 (1fig2.png)

Quick Aside on Signal Notation

Continuous Time signals are represented as ft f t where t∈ℝ t . Discrete Time signals are represented as fn f n where n∈ℤ n

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