ABSTRACT
In this chapter, we introduce the concept of impulse response of a system and we discuss the possible interconnections between two or more systems. Moreover, the process of convolution, which is one of the most important concepts in signals and systems theory, is established for both continuous-and discrete-time systems. Furthermore, we present how a system can be described by a differential or a difference equation, and finally we discuss the finite impulse response and infinite impulse response filters.
