B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011.
Fifth Semester
Electronics and Communication Engineering
EC 2302 — DIGITAL SIGNAL PROCESSING
(Common to PTEC 2302 Digital Signal Processing for B.E. (Part-Time) Electronics and Communication Engineering Fourth Semester – Regulation 2009)
(Regulation 2008)
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 meant by bit reversal?
3.
Why do we go for analog approximation to design a digital filter?
4.
Give any two properties of chebyshev filters.
5.
State the properties of FIR filters.
6.
What is meant by Gibbs Phenomenon?
7.
What is meant 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 (8)
(ii) overlap-add method. (8)
Or
(b) Explain Radix-2 DIF-FFT algorithm. Compare it with DIT-FFT algorithms. (16)
12.
(a) Explain in detail butterworth filter approximation. (16)
Or
(b) Explain the bilinear transform method of IR filter design. What is warping effect? Explain the poles and zeros mapping procedure clearly. (16)
13.
(a) Realize the system function ( )
by linear phase
FIR structure. (16)
Or
(b) Explain the designing of FIR filters using windows. (16)
14.
(a) Explain the quantization process and errors introduced due to quantization. (16)
Or
(b) (i) Explain how reduction of product round-off error is achieved in digital filters (8)
(ii) Explain the effects of coefficient quantization in FIR filters. (8)
15.
(a) (i) Explain how various sound effects can be generated with the help of DSP. (10)
(ii) State the applications of multirate signal processing. (6)
Or
(b) (i) Explain how DSP can be used for speech processing. (8)
(ii) Explain in detail about decimation and interpolation. (8)
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