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Posted By: sunil Member Level: Diamond Posted Date: 23 Jun 2008
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2008 II B.Tech II Semester Regular Examinations, Apr/May 2008 DIGITAL SIGNAL PROCESSING Question paper
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Code No: R05320201
Set No. 4
III B.Tech II Semester Regular Examinations, Apr/May 2008
DIGITAL SIGNAL PROCESSING
( Common to Electrical & Electronic Engineering, Electronics &
Communication Engineering, Electronics & Instrumentation Engineering,
Electronics & Control Engineering, Electronics & Telematics and
Instrumentation & Control Engineering)
Time: 3 hours
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Max Marks: 80
1. (a) De?ne the following terms as referred to LTI discrete time system:
i. Stability
ii. Causality
iii. Time invariance
iv. Linearity.
(b) Determine whether the following system is
i. Linear
ii. Causal
iii. Stable
iv. Time invariant
y (n) = log10|x (n)|
Justify your answer.
[16]
2. (a) De?ne DFT of a sequence x(n). Obtain the relationship between DFT and
DTFT.
(b) Consider a sequence x(n) = {2, -1, 1, 1} and T = 0.5 compute its DFT and
compare it with its DTFT.
3. (a) Implement the decimation in time FFT algorithm for N=16.
[8+8]
(b) In the above Question how many non - trivial multiplications are required.
[10+6]
4. (a) Explain how the analysis of discrete time invariant system can be obtained
using convolution properties of Z transform.
(b) Determine the impulse response of the system described by the di?erence
equation y(n)-3y(n-1)-4y(n-2)=x(n)+2x(n-1) using Z transform.
5. (a) Describe digital IIR ?lter characterization in Z ? domain.
(b) Find H(Z) using Impulse Invariant method for given analog system.
H(s) = 1/(s + 0.5) (s2+0.5s+2)
6. (a) Describe the FIR ?lter characteristics in time domain.
1 of 2
[8+8]
[6+10]
Code No: R05320201
Set No. 4
(b) Determine the frequency response of a linear phase FIR ?lter given by
y(n) = A1x(n) + A2x(n - 1) + A3x(n - 2) + A2x(n - 3) + A1x(n - 4). [6+10]
7. (a) Discuss the applications of Multirate Digital Signal Processing.
(b) Describe the decimation process with a factor of ‘ M ’. Obtain necessary
expression.
8. (a) What are the advantages of CISC?
(b) What are the advantages of RISC?
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