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Pune University - Sem - III : DSP System Application, April 2010 (Old Course)

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Total No. of Questions : 5] P1165 [Total No. of Pages : 3 [3729]- 31 M.Sc. (Sem. - III) ELECTRONIC SCIENCE EL3 UTO5 : DSP Systems and Applications (2004 Pattern) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates: 1) 2) 3) All questions are compulsory. Figures to the right indicate full marks. Draw neat diagrams wherever necessary. Q1) Attempt any two of the following : a) [2 8 = 16] Check whether the following discrete time system is linear or not ? i) y (n) = ax(n) + b ii) y ( n) = x ( n ) cos on b) What are singularity functions ? Explain different types of singularity functions. c) A digital communication link carries binary coded words representing samples of input signal x(t)=3cos 600 t + 2 cos 1800 t .The link is operated at 10,000 bits/ sec and each input sample is quantized into 1024 different voltage levels. Calculate sampling frequency and folding frequency in Hz. Find out resolution of quantization. Q2) Attempt any two of the following : [2 8 = 16] a) Draw a block diagram representing the Architecture of typical DSP processor. Explain the need and operational features of it in detail. b) Explain application of DSP in modulation and demodulation of digital signals. c) List various kinds of peripheral interfaces incorporated in typical DSP. Explain their role in brief. P.T.O. Q3) Attempt any two of the following : a) [2 8 = 16] i) Compare fixed point and floating point DSP processor. ii)What is Von Neumann architecture and Harward architecture? which is used in DSP? b) Explain with suitable example correlation of DT signals. Discuss crosscorrelation and autocorrelation sequences. c) List features of FIR filter. Write steps of designing FIR filters using various kinds of windows. Q4) Attempt any two of the following: a) [2 8 = 16] i) For an analog signal xa (t) = 3 cos 50 t + 10 sin 300 t -cos 100 t calculate Nyquist rate. ii)Determine Z transform of x(n) = (n+1) u (n). Draw ROC diagram for it. b) Find out H (z) using impulse invariance method at 5 Hz sampling frequency from H (s) as given below. H (s) = c) 2 ( s + 1)( s + 2) Draw the block diagram of Analog to Digital converter. Explain quantization and quantization error. Q5) Attempt any two of the following : a) [2 8 = 16] A system has impulse response h (n) . poles and zeros of system are at z1=1. P1 = 1 1 , P2 = . 2 4 Draw poles and zeros of a system if its impulse response is h1(n) = h (n-z). [3729]-31 - 2- b) Find the linear convolution of x1 (n) and x2 (n). if x1 (n) = {1,2,3,4} and x2 (n) = {1,1,1} obtain the same result using circular convolution. c) Draw the block diagram for two pole, two zero IIR filter. Hence draw the signal flowgraph for the same. State applications of signal flowgraph. zzzz [3729]-31 - 3-

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Additional Info : M.Sc. - II Electronic Science, EL3 UT 05 : DSP System Application (Old Course) (Semister - III), Pune University
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