ECE402 Introduction

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Intended Learning Outcomes

Describe signals systems and signal processing. Compare and contrast analog signal processing and digital signal

processing. Distinguish between the classifications of signals.

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Classifications of Signals

Continuous-Time Signal Discrete-Time Signal Continuous-Valued Signal Discrete-Valued Signal

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Classifications of Signals

Continuous-Time Signals: signal is defined for every value of time in a given interval (a,b), where a - and b .

Examples: voltage as a function of time, height as a function of pressure, number of positron emissions as a function of time.

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Classifications of Signals

Discrete-Time Signals: signal is defined only for certain specific values of time; typically taken to be equally spaced points in an interval.

Examples: number of stocks traded per day, average income per province.

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Classifications of Signals

Continuous-Valued Signals: signal amplitude takes on a spectrum of values with in one or more intervals.

Examples: color, temperature, pain-level

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Classifications of Signals

Discrete-Valued Signals: signal amplitude takes on values from a finite set.

Examples: digital image, population of a country