Chapter 1Practical MATLAB with Signals Theory
The study of signals theory is both mathematically intensive and visually rich. This is a subject traditionally tackled with a scientific calculator, a sharp pencil, and an ample supply of graph paper. While various high-level computer languages can be applied to advanced numerical computations and graphical output, their implementations often lack the convenience of being able to evaluate a single expression or to create a quick plot. By comparison, MATLAB® is a commercial computing environment1 that allows the execution of single statements from an integrated user interface while fully incorporating the classic transformations and algorithms that define modern signal processing.
This introductory chapter presents an overview of fundamental MATLAB-based tools and techniques relevant to the study of signals theory. Other MATLAB functions will be introduced as required, and Appendix E contains additional reference material.
In the context of this chapter, the term signal refers to a time-varying waveform described by a mathematical function of time, such as
, while system implies any hardware or software with which a signal inevitably interacts. It follows that signals theory deals with the often conceptual study of signals and systems.
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