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Unformatted text preview: 1 EE102 Spring 200910 Lee Systems and Signals Homework #2 Due: Tuesday, April 20, 2010 at 5 PM. 1. State whether the following systems are linear or nonlinear; time invariant or time variant; and why. (a) y ( t ) = x ( t ) sin( t + ) (b) y ( t ) = x ( t ) x ( t 1) (c) y ( t ) = 1 + x ( t ) (d) y ( t ) = cos( t + x ( t )) (e) y ( t ) = t x ( ) d (f) y ( t ) = t/ 2 x ( ) d 2. A periodic signal x ( t ) , with a period T , is applied to a linear, timeinvariant system H . Show that the output y ( t ) y ( t ) = H ( x ( t )) is also periodic, with period T . 3. Sample and hold system. A sample and hold (S/H) system, with sample time h , is described by y ( t ) = x ( h t/h ) , where a denotes the largest integer that is less than or equal to a . Sketch an input and corresponding output signal for a S/H, to illustrate that you under stand what it does. Is a S/H system linear? 4. Consider a system that takes a signal x ( t ) and returns the even part of x ( t ) as its output x e ( t ) = H ( x ( t )) where x e ( t ) is the even part of x ( t ) . Is this system linear? Is it time invariant? 2 5. Write the following signals as a combination (sums or products) of scaled and shifted unit rectangles rect ( t ) and unit triangles ( t ) . 21 12 1 221 x(t) a) 21 12 1 221 t x(t) b) 6. System Equations from Block Diagrams Find the differential equation that correspond to this block diagram. Hint: Label all of the intermediate signals, and write equations for each.Label all of the intermediate signals, and write equations for each....
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This note was uploaded on 12/09/2010 for the course EE ee102 taught by Professor Levan during the Spring '09 term at UCLA.
 Spring '09
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