_Signal_Exam05AprQes - EE2009/EE2009E Signals / page 1...

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EE2009/EE2009E Signals / page 1 NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION Semester II: 2004/2005 EE2009 – SIGNALS April 2005 – 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 power spectrum of a biomedical signal as measured by a spectrum analyzer is shown in Fig. Q1(a). Taking the signal to consist of some symmetric deterministic components in the presence of white noise, write down the form of the signal after making some appropriate assumptions. Write down the assumptions made. 01 02 03 04 0 Hz 0 20 40 60 dB Fig. Q1(a) (15 Marks) (b) The signal from Q.1(a) is passed into a filter with a frequency response of . If () f H () 2 = f H , will the shape of the signal be preserved? What about its power, amplitude and phase spectra? (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) Derive the spectrum of the signal given in Fig. Q2(a) from first principle. Is the spectrum purely real or purely imaginary or neither? Does it have infinite extent? t 3 0 t e 1 . 0 Fig. Q2(a) (15 Marks) (b) The signal of Fig. Q2(a) is used to frequency modulate a carrier of 100 MHz for transmission to a remote site. Write down the form of the frequency modulated signal at a frequency sensitivity of 5.
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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_Exam05AprQes - EE2009/EE2009E Signals / page 1...

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