Summary: AMERICAN UNIVERSITY OF BEIRUT
FACULTY OF ENGINEERING AND ARCHITECTURE
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
EECE691C Digital Signal Processing Laboratory Week 4
Digital Systems Pre-lab
1 Overview and Goals
In the previous lab, you learned the basics of digitizing signals. Now that all signals are
represented by a sequence of numbers, the next step is to make some use of them. In this pre-lab
you will prepare yourself to experiment with digital systems by looking at some of their
properties and taking into account their underlying practical value. The outline is as follows:
1. General 1-D digital systems.
2. Linear Time Invariant (LTI) systems.
2 General 1-D Digital Systems
The concept of a system is recurrent in engineering. This fact is largely because most physical
systems can be thought of as subject to external stimuli, or inputs, according to which some sort
of response, or outputs, is (are) produced. Consistently with this natural picture, a digital system
is therefore one that accepts a digital signal as its input, and generates another digital signal as its
output. Of course, this single input single output scheme can be generalized to multiple inputs and
multiple outputs, but we will restrict ourselves here to the simpler case.
x(n) Digital System y(n)