SUMMARY

In this chapter, we introduced the following concepts.

A signal was defined as a function of time, either continuous or discrete.
A system was defined as a mathematical relationship between an input signal and an output signal.
Special types of signals were studied: real and complex exponential signals, sinusoidal signals, impulse and step signals.
The main properties of a system were introduced: linearity, memory, causality, time invariance, stability, and invertibility.

Copyright Career & Professional Group, a division of Thomson Learning, Inc. 2006 under license agreement with Books24x7

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