Digital Signal Processing Using MATLAB and Wavelets

Chapter 4 - Sinusoids

Most analog signals are either sinusoids, or a combination of sinusoids (or can be approximated as a combination of sinusoids). This makes combinations of sinusoids especially interesting. It is easy to add sinusoids together; pressing keys on a piano or strumming a guitar adds several sinusoids together (though they do decay, unlike the sinusoids we usually study). In this chapter, we will investigate sinusoids and see how they can be added together to model signals. The goal is to gain a better understanding of sinusoids and get ready for the Fourier transform.

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