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Linear Systems

Authored on: Mar 7, 2005 by Steven W. Smith

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Most DSP techniques are based on a divide-and-conquer strategy called superposition. The signal being processed is broken into simple components, each component is processed individually, and the results reunited. This approach has the tremendous power of breaking a single complicated problem into many easy ones. Superposition can only be used with linear systems, a term meaning that certain mathematical rules apply. Fortunately, most of the applications encountered in science and engineering fall into this category. This chapter presents the foundation of DSP: what it means for a system to be linear, various ways for breaking signals into simpler components, and how superposition provides a variety of signal processing techniques.

The Scientist and Engineer's Guide to Digital Signal Processing, ©1997-1998 by Steven W. Smith. For more information visit the book's website at: www.DSPguide.com

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