_Signal_Exam03AprQes

# _Signal_Exam03AprQes - NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR THE DEGREE OF B.ENG(ELECTRICAL B.ENG(COMPUTER ENG(Semester II 2002/2003

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NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR THE DEGREE OF B.ENG. (ELECTRICAL) / B.ENG. (COMPUTER ENG.) (Semester II: 2002/2003) EE2009 - SIGNALS May 2003 – Time Allowed: 2 Hours INSTRUCTIONS TO CANDIDATES: 1. This paper contains SIX (6) questions and comprises SIX (6) printed pages. 2. Answer any TWO ( 2 ) questions from Section A, and any TWO ( 2 ) questions from Section B. 3. All questions carry equal marks. 4. This is an OPEN BOOK examination.

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EE2009 SIGNALS / Page 2 SECTION A (A NSWER A NY TWO Q UESTIONS ) Q.1 (a) Determine the energy and power of the signal () ( ) t j a e t t x α 2 3 cos + = when 3 . Will you get the same answer if 3 = ? Why? (13 Marks) (b) What is the condition under which t j a e t t x 2 3 cos + = is periodic? (7 Marks) (b) An optical communication engineer uses an optical spectrum analyzer to study the characteristics of a light source. The spectrum observed is as shown in Fig. Q.1 (c). If the light source is shined onto a white wall, what is the color that would likely be seen? Explain. (5 Marks) p 3 p spectrum power f γ 10 red blue Fig. Q.1(c)
EE2009 SIGNALS / Page 3 Q.2 (a) To measure the reverberation characteristic of a concert hall, an acoustic engineer applies a very narrow high power pulse to a loudspeaker and measures the output from a microphone inside the hall. He finds that the output can be modeled as () ( ) 1 . 0 30 = t u e t x t a , where () t u is the unit step function. What is the shape of the frequency response?

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## This note was uploaded on 08/02/2009 for the course ECE EE2009 taught by Professor Prof.c.c.ko during the Fall '07 term at National University of Singapore.

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_Signal_Exam03AprQes - NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR THE DEGREE OF B.ENG(ELECTRICAL B.ENG(COMPUTER ENG(Semester II 2002/2003

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