SRM University 2007 B.Tech Electronics and Communications Engineering BANK : EC303 – DIGITAL SIGNAL PROCESSING - Question Paper

S.R.M. INSTITUTE OF SCIENCE & TECHNOLOGY
SCHOOL OF ELECTRONICS & COMMUNICATION ENGINEERING
ques. BANK
EC303 – DIGITAL SIGNAL PROCESSING
UNIT - I
PART-A

1. Differentiate among analog, discrete, quantized and digital signal.
2. Draw the basic block diagram of a digital processing of an analog signal.
3. Draw the basic structure of a linear constant difference formula.
4. Define transfer function.
5. Differentiate Fourier series & Fourier transform.
6. Give the DFT pair.
7. How Z-transform is related to DFT?
8. When a discrete time signal is stated to be symmetric (or) anti-symmetric?
9. State Parseval’s relation in DFT & Z-transform.
10. Determine the DTFT of the sequence x (n) = {1, -1, 1, -1}.
11. How is FFT faster?
12. What ate the advantages of disadvantages of FIR filter?
13. Name the various structures to implement IIR system.
14. What do you understand by linear phase response?
15. Give the mathematical and graphical representation of a) Unit sample sequence b) Unit step sequence.
16. Define a stable system and what is the condition for stability.
17. Find the convolution of the subsequent using Z-transform x (n) = {1, 2, 1} & h (n) = {1, 1, 1}.
18. Find the DFT of a sequence x (n) = {1, 1, 0, 0}.
19. Calculate the number of multiplication’s needed in the computation of DFT and FFT with 64 point sequence.
20. What is meant by in – place in DIT and DIF algorithms?
21. elaborate the conditions to be satisfied by the impulse response of FIR filter to have a linear phase?
22. What is BIBO stability?
23. How will you perform linear convolution using circular convolution?
24. What is causality condition for an LTI system?
25. What are the various methods of evaluating inverse Z-transform?
26. What is zero-padding? elaborate its uses?
27. How many multiplication’s and additions are needed to calculate N-point DFT using radix –2 FFT?
28. Draw the direct form realization of FIR system.
29. What is linear phase?
30. Draw the basic butterfly diagram for the calculation in the DIT-FFT & DIF-FFT
31. Draw the DF-I structure of the system. Y (n) = 0.5 x (n) + 0.9 u (n-1).
32. Sketch the discrete time signal x (n), x (n) = four ? (n+4) + ? (n) + two ? (n -1) + ? (n-2) - five ? (n-3).
33. Find the periodicity of x (n), x (n) = cos (2?n/7).
34. Determine the stability of the system, whose transfer function, H(z), provided by H(z) = 1/ 1-4 z-1 + 3z-2.
35. List any 4 properties of DFT.
36. List any 4 properties of z – transform.
37. List out the properties of ROC in Z –transform.
38. Define a static and a stable system.
39. Define commutative and associative legal regulations of convolution.
40. Define impulse response of a signal.
41. What are the methods adopted for sectioned convolution?
42. Write the expression for twiddle factor.

Earning:   Approval pending.