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Unformatted text preview: ContinuousTime Convolution EE 313 Linear Systems and Signals Fall 2008 Courtesy of Prof. Brian Evans Prof. Adnan Kavak Dept. of Electrical and Computer Engineering The University of Texas at Austin 4  2 Useful Functions Unit gate function (a.k.a. unit pulse function) What does rect(x / a) look like? Unit triangle function ( 29 < = = 2 1 1 2 1 2 1 2 1 rect x x x x ( 29 < = 2 1 2 1 2 1 x x x x 1 1/21/2 x rect( x ) 1 1/21/2 x ( x ) 4  3 ( 29 ( 29 ( 29 ( 29 t Y T t y c T t f c t F m i i i m i i i =   = = = 1 1 LTI Systems Recall for LTI system with input f and output y Homogeneity: c f ( t ) c y ( t ) Timeinvariance: c f ( t T ) c y ( t T ) Adding additivity: If a signal ( F ( t ) ) can be expressed as a sum of shifted ( t  T i ) and weighted ( c i ) copies of a simpler signal ( f ( t ) ), we easily find a systems output ( Y ( t ) ) to that signal if we only know systems output ( y ( t ) ) to that simpler signal A common choice for f ( t ) is the impulse 4  4 Impulse Response Impulse response of a system is response of the system to an input that is a unit impulse (i.e., a Dirac delta functional in continuous time) Linear constant coefficient differential equation When initial conditions are zero, this differential...
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This note was uploaded on 02/10/2009 for the course EE 313 taught by Professor Cardwell during the Spring '07 term at University of Texas at Austin.
 Spring '07
 Cardwell
 Gate

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