_Signal_Exam04NovQes - NATIONAL UNIVERSITY OF SINGAPORE...

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NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR Semester I: 2004/2005 EE2009/EE2009E – SIGNALS November/December 2004 – Time Allowed: 2 Hours INSTRUCTIONS TO CANDIDATES : 1. This paper contains SIX ( 6) questions and comprises NINETEEN (19) 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. 5. Write your matric number and the numbers of the questions you have attempted in the spaces provided below. 6. All your answers must be written neatly in the appropriate spaces provided in the question paper. QUESTION NUMBER MARKS TOTAL MATRICULATION NUMBER :
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EE2009/EE2009E Signals / page 2 SECTION A (Answer Any TWO Questions) Q.1 (a) The pulse used for the purpose of distance measurement in a ranging system is shown in Fig. Q1(a). If this signal is captured using a spectrum analyzer, what will be shown on its display? t 0 2 5 () t x Fig. Q1(a) (15 Marks) (b) To improve the accuracy of the ranging system, a sequence of pulses, each with shape as given by Fig. Q1(a), is sent instead of a single pulse. The interval between two adjacent pulses is 10 seconds. How will the spectrum of the signal change as more and more pulses are sent? (10 Marks) Give your answer to Q.1 in the space below. If necessary, continue on the next two pages.
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EE2009/EE2009E Signals / page 3 You may continue your answer to Q.1 on this blank space if necessary.
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EE2009/EE2009E Signals / page 4 You may continue your answer to Q.1 on this blank space if necessary.
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EE2009/EE2009E Signals / page 5 Q.2 (a) A hifi enthusiastic injects a narrow pulse of width s 1 µ into his surround sound system. The waveform he captured from the system is given by in Fig. Q2(a). Make some relevant assumptions and help him to sketch the output if the input is given by in Fig. Q2(a). Will the output be periodic if the input is periodic?
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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_Exam04NovQes - NATIONAL UNIVERSITY OF SINGAPORE...

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