In typical applications of science and engineering, we have to
process signals, using systems. While the applications can be varied
large com-munication systems to control systems but the basic
analysis and design tools are the same.
In a signals and systems course, we study these tools:
convolution, Fourier analysis, z-transform, and Laplace transform.
The use of these tools in the analysis of linear time-invariant (LTI)
systems with determin-istic signals.
For most practical systems, input and output signals are continuous
and these signals can be processed using continuous systems.
However, due to advances in digital systems technology and numerical
algorithms, it is advantageous to process continuous signals using
digital systems by converting the input signal into a digital signal.
Therefore, the study of both continuous and digital systems is required.
As most practical systems are digital and the concepts are
relatively easier to understand, we describe discrete signals and
systems rst, im-mediately followed by the corresponding description
of continuous signals and systems.