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Engineering Science by Lloyd Dingle, Mike Tooley

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Chapter 30 Complex waveforms and Fourier analysis

30.1 Harmonics

As mentioned in Chapter 25, the sine wave is the most fundamental of all wave shapes and all other waveforms can be synthesised from sinusoidal components. To specify a sine wave, we need to consider just three things: amplitude, frequency and phase. Since no components are present at any frequency other than that of the fundamental sine wave, such a wave is said to be a pure tone. All other waveforms can be reproduced by adding together sine waves of the correct amplitude, frequency and phase. The study of these techniques is called Fourier analysis and we will explain what this ...

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