B.E./B.Tech. DEGREE EXAMINATION, April/May 2011
3rd year Fifth Semester.
Department of Electronics and Communication Engineering.
EC 2302 DIGITAL SIGNAL PROCESSING
Time : Three hours Maximum : 100 Marks
Answer ALL questions
PART A (10 2 = 20 Marks)
1.State the advantages of FFT over DFTs.
2.What is mean by bit reversal?
3.Why do we go for analog approximation to deisgn a digital filter?
4.Give any two properties of chebyshev filters.
5.State the properties of FIR filters.
6.What is mean by Gibbs phenomenon?
7.What is mean by fixed point arithmetic?Give example.
8.Explain the meaning of limit cycle oscillator.
9.State the various applications of DSP.
10.What is echo cancellation?
PART B (5 16 = 80 Marks)
11(a)With appropriate diagrams describe (i)overlap-save method,(ii)overlap-add method.
(b)Explain Radix-2 DIF-FFT algorithm.Compare it with DIT-FFT algorithms.
12(a)Explain in detail Butterworth filter approximation.
(b)Expalin the bilinear transform method of IR filter design.What is warping effect?Explain the poles and zeros mapping procedure clearly.
13(a)Realize the system function H(z)=(2/3)z+1+(2/3)z(to the power -1) by linear phase FIR structure.
(b)Explain the designing of FIR filters using windows.
14(a)Explain the quantization process and errors introduced due to quantisation.
(b)(i)Explain how reduction of product round-off error is achieved in digital filters.
(ii)Explain the effects of coefficient quantisation in FIR filters.
15(a)(i)Explain how various sound effects can be generated with the help of DSP.
(ii)State the applications of multirate signal processing.
(b)(i)Expalin how DSP can be used for speech processing.
(ii)Explain in detail about decimation and interpolation.
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