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Unformatted text preview: 1 EE102 Systems and Signals Fall Quarter 2011 Jin Hyung Lee Homework #3 Solutions 1. Analytically compute the convolution ( f * g )( t ) , where f ( t ) and g ( t ) are f ( t ) = u ( t ) e t g ( t ) = rect( t ) and sketch a plot of the result. Solution There are several ways to do this. The most direct, is to write out the convolution integral ( f * g )( t ) = Z  e u ( )rect( t ) d = Z e rect( t ) d If t < 1 / 2 , the rect() is completely to the left of the origin, and the integral is zero. If 1 / 2 < t < 1 / 2 the rect() overlaps the origin, and the limits of the integral are from 0 to t+1/2 ( f * g )( t ) = Z t +1 / 2 e d = e t +1 / 2 = 1 e ( t +1 / 2) If t > 1 / 2 , then the rect() is to the right of the origin, and ( f * g )( t ) = Z t +1 / 2 t 1 / 2 e d = e t +1 / 2 t 1 / 2 = e ( t 1 / 2) e ( t +1 / 2) = e t ( e 1 / 2 e 1 / 2 ) . This is plotted below. 2 1 1 2 3 4 5 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Time Amplitude 2. Show the somewhat surprising result that the convolution of two impulse functions, y ( t ) = Z ...
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This note was uploaded on 12/13/2011 for the course EE 102 taught by Professor Levan during the Fall '08 term at UCLA.
 Fall '08
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