_Signal_Exam04AprQes - NATIONAL UNIVERSITY OF SINGAPORE...

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NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR THE DEGREE OF B.ENG. (ELECTRICAL) / B.ENG. (COMPUTER ENG.) (Semester II: 2003/2004) EE2009 - SIGNALS April 2004 – Time Allowed: 2 Hours INSTRUCTIONS TO CANDIDATES: 1. This paper contains SIX (6) questions and comprises FIVE (5) 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) The signal in a musical synthesizer has a form given by ( 29 ( 29 ( 29 t f a t t x a 1 1 cos 1000 sin p 2 + = . For 1000 1 = f , determine the power and energy of this signal. Does this signal have a Fourier series? (10 Marks) (b) An engineer is using a spectrum analyzer to measure the characteristics of some signals in a biomedical instrument. Fig. Q1(b) shows the spectra he observed for two such signals. Make some appropriate assumptions and sketch the corresponding waveforms in the time domain. Indicate the important features and values. In general, is it possible to determine the time waveform exactly from the display on the analyzer? Why? (15 Marks) Fig. Q1(b) 0 Power f 100 20 dB 0 0 Power f 100 20 dB 0
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EE2009 SIGNALS / Page 3 Q.2 (a) In a communication system, the receiver is at a distance d from the transmitter. A signal
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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_Exam04AprQes - NATIONAL UNIVERSITY OF SINGAPORE...

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