EE3TP4_3_DTSignals_v2_Lecture 5

EE3TP4_3_DTSignals_v2_Lecture 5 - Discrete-Time Signals...

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1/12 Discrete-Time Signals These overheads were originally developed by Mark Fowler at Binghamton University, State University of New York.
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2/12 What is a discrete-time (D-T) signal? A discrete time signal is a sequence of numbers indexed by integers Example: x [ n ] where n = …, - 3, -2, -1, 0, 1, 2, 3, … Brackets indicate discrete-time signal. We use parentheses to indicate a C-T signal. x [ n ] n A stem plot emphasizes that the signal does not exist in-between integer n values Sometimes we violate this and plot with line segments connecting the dots. Remember : for our point of view, D-T signals are needed to allow us to process signals (i.e. information) using D-T systems rather than only Continuous-Time systems
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3/12 D-T systems allow us to process information in much more flexible way than C-T systems! C-T system (RLC, etc.) D-T system (computer) Analog to Digital Converter (ADC) Sensor x ( t ) y ( t ) y [ n ] z [ n ] T 2T 3T “sampling” is how we typically get D-T signals In this case the D-T signal y [ n ] is related to the C-T signal
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This note was uploaded on 02/01/2011 for the course ECE 3TP4 taught by Professor Drterrencetodd during the Fall '10 term at McMaster University.

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EE3TP4_3_DTSignals_v2_Lecture 5 - Discrete-Time Signals...

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