The electromagnetic spectrum is the range of all possible frequencies of electromagnetic waves . The spectrum is broken into regions/ranges and classified by frequency and/or wavelength. The frequency (f ) of an electromagnetic wave is a measure of how rapidly it oscillates.
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Frequency spectrum of a signal is the range of frequencies contained by a signal . For example, a square wave is shown in Fig. 3.5A. It can be represented by a series of sine waves, S(t) = 4A/π sin(2πft) + 4A/3π sin(2π(3f)t) + 4A/5π sin(2π(5f)t + …)
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