Anna University Model Question Paper BE V sem IT DIGITAL SIGNAL PROCESSING
ANNA UNIVERSITY :: CHENNAI – 600 025
MODEL QUESTION PAPER
V SEMESTER
B.TECH. INFORMATION TECHNOLOGY
IF351 – DIGITAL SIGNAL PROCESSING
Time : 3 Hours Max. Marks : 100
Answer all Questions
PART – A (10 X 2 = 20 MARKS)
- State and prove the convolution property of Z transform.
- Check the system is linear or not y(n) = x(n)+ay(n-1)
- Write equations for finding DFT and IDFT using Z transform.
- Draw the radix 2 butterfly structure for DIF
- Draw the implementation for the generalized for IIR filter using direct form II.
- Explain how the addition and multiplication of (H1, H2) impulse responses implemented in filter design
- Write equations for Hanning and Blackman window.
- Why frequency prewarping procedure is adopted in the design of IIR filter?
- Write two advantages of musical sound processing and briefly explain.
- Explain the effects due to upsampling.
PART – B (5 x 16 = 80 Marks)
11.i) The impulse response of a linear TI system is h(n) = {1, 0, 1, -1}. Find the response of the system to the input signal x(n) = {1, 0, 2, 1}.
ii) Check whether the system y(n) = x(n) – x(n-1) is LTI and stable.
12.a) Develop and draw the 8 point radix-2 DIT FFT algorithm for DFT computation.
(OR)
12.b) Compute the DFT of the following sequence
x(n) = 0 0£ n £ 2
= 1 3£ n £ 6
= 0 n=7
Plot magnitude and phase spectra
13.a) Design a LPF with following specifications. Use Hamming window and at least 8 points.
/2 |
– /2 |
0 |
1 |
H(eiw) |
(OR)
13.b)i) Obtain H(z) from H(s) when T = 1 sec.
ii) Design a digital BPF using w1 & w2 as cutoff frequencies
14.a)i) Perform the following using Floating Point arithmetic.
1.5 x 1.75 and 1.5 x 1.75
ii) Realize the following H(z) given by
using cascade and Parallel form with Direct form-I.
(OR)
14.b)i) What is meant by quantization error? Explain briefly.
ii) Realize the following filter using cascade technique with DF-I and DF-II.
15.a) Briefly explain
- Interpolator
- Decimator
- Effects due to sampling rate conversion
(OR)
15.b)i) Write a note on Musical sound processing
ii) Explain how the data compression is achieved in speech signal and discuss a technique to check the quality.
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