In this chapter, we outline the Signal Theory as it is usually presented in textbooks, where each class of signals is separately developed. “Separately” means that, for each class, definitions and development are presented independently. For convenience, we call this approach the Classical Signal Theory in contrast to the approach of this book, the Unified Signal Theory. The classes of signals we will consider are:
These classes are introduced to give readers the classical background, before dealing with the Unified Theory.
Aperiodic continuous-time signals,
Periodic continuous-time signals,
Periodic discrete-time signals,
Periodic discrete-time signals.
KeywordsImpulse Response Periodic Signal Real Signal Sampling Theorem Continuous Signal
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