SPPU Computer Engineering (Semester 6)
Digital Signal Processing Applications
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Solve any one question from Q1 and Q2
1 (a) State the mathematical models used to represent a DT system. Define the Impulse response of the system.
5 M
1 (b) State the necessary condition for the existence of Fourier Transform. State and prove the convolution property of FT.
5 M

2 (a) What is the use of Transducers in signal processing? State the sampling Theorem.
5 M
2 (b) State the following properties of DT system and describe it by means of difference equation:
i) Time Invariant
ii) Dynamicity
iii) Causality
5 M

Solve any one question from Q3 and Q4
3 (a) Draw a pole zero plot for a system described as
y(n) = x(n) - x(n -1) + 3y(n - 1) - 2y(n - 2)
5 M
3 (b) Draw the basic butterfly structures for DIT and DIF FFT algorithms and hence obtain the computational complexity of FFT algorithm.
5 M

4 (a) Use ZT properties to obtain ZT of a DT sequence x(n) = an u(n - 1).
5 M
4 (b) What is convolution property of DFT? Compare Linear Convolution with Circular Convolution.
5 M

Solve any one question from Q5 and Q6
5 (a) Obtain and realize Direct Form - I and Direct Form - II IIR filter structure for a system described as- [ y(n) = y(n-1) - \dfrac {1}{2} y (n-1) + x(n) - x(n-1) + x(n-2) ]
9 M
5 (b) Discuss the form of Linear Phase FIR filter structure and realize it for M = 7 where M is the length of the filter (i.e. 6th order filter)
9 M

6 (a) Obtain parallel form realization for IIR filter having transfer function [ H(z) = \dfrac {1+2z^{-1}+z^{-2}}{1-0.75z^{-1}+0.125 z^{-2}} ]
9 M
6 (b) What are filter structures? Explain how the Direct and Cascade form of FIR filters are obtained and realized from the system function H(z).
9 M

Solve any one question from Q7 and Q8
7 (a) Explain the characteristics of DSP processor. Explain basic building blocks of DSP processor.
8 M
7 (b) What is OMAP? Explain the Software architecture of OMAP in brief.
8 M

8 (a) Compare conventional microprocessor architecture with Harvard and SHARC DSP architectures with important features.
8 M
8 (b) Draw and explain the architecture of SHARC DSP processor.
8 M

Solve any one question from Q9 and Q10
9 (a) What is Companding? How important this process is in audio processing? Explain the Companding process in brief.
8 M
9 (b) What is image enhancement in digital image processing? Explain any two gray level transforms used for image enhancement.
8 M

10 (a) Draw and explain block diagram of compact disk playback system.
8 M
10 (b) Explain the operation of CCD (Charge Coupled Device) used in electronic cameras?
8 M



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