In engineering programs, students usually learn about signals and systems first in the time domain and then in the frequency domain. The focus is on deterministic signals such as those illustrated in Figure 1.19.

Figure 1.19 Examples of deterministic signals: sinusoid , exponential , and step where u(t) is the unit-step function.


1.2.1 Continuous Time

Nonrandom signal x(t) is a function of continuous time . Consider the sinusoidal signal

(1.15) Numbered Display Equation

shown in Figure 1.19 for where u(t) is the unit-step (Heaviside) function (see Appendix B). Radian frequency ω (radians/second) is related to ordinary frequency f in hertz (Hz) according to . For a particular ...

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