SP 2005 Ch 1 Introduction

# SP 2005 Ch 1 Introduction - EE 3120 Linear Signals and...

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EE 3120 Linear Signals and Systems Chapter 1 Introduction to Signals and Systems

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Linear Systems and Signals Lecture 1 Introduction to signals and systems Signals: single valued functions that carry information (e.g. voice, radar, control, heart EKG, brainwaves, 2-D pictures {x,y}, 3-D video or RF electromagnetic radiation {x,y,t}) Systems: perform some kind of manipulation (processing) of signals (e.g. microphone, speaker, amplifier, demodulator) Systems can be electrical, mechanical, hydraulic, etc. Continuous time signals – signals defined at every instant in time. Usually denoted f(t) for all t (-∞,∞). In reality, no signal starts from -∞ and lasts forever but it is convenient to represent signals this way. Discrete time signals – signals defined only at discrete instants of time, but have a continuous range of amplitudes Digital signals – discrete time signals with discrete (quantized) amplitudes
Size of a Signal Many times engineers are interested in quantifying a signal. The two most common ways of quantifying a signal is by computing the

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## This note was uploaded on 02/06/2012 for the course EE 2120 taught by Professor Aravena during the Fall '08 term at LSU.

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SP 2005 Ch 1 Introduction - EE 3120 Linear Signals and...

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