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**Unit IV**

1. What is FIR filter ?

2. Advantage of FIR Filters.

3. Disadvantage of FIR filters.

4. What are theConditions to be satisfied for constant phase delay in linear phase FIR filters?

5. What are the possible types of impulse response for linear phase FIR filter?

6. Write magnitude and phase function of FIR filter when impulse response is symmetric and N is odd?

7. Write magnitude and phase function of FIR filter when impulse response is symmetric and N is even?

8. Write magnitude and phase function of FIR filter when impulse response is anti- symmetric and N is odd?

9. Write magnitude and phase function of FIR filter when impulse response is anti-symmetric and N is even?

10. List the well known design techniques for linear phase FIR filter

11. What is Gibbs phenomenon (or) Gibbs oscillation?

12. What is the procedure for designing FIR filter using windows ?

13. Write the procedure for FIR filters designed by frequency sampling method.

14. What is the drawback of FIR filter design using windows and frequency sampling method? How is it overcome ?

15. Write the characteristic feature of rectangular window.

16. List the features of FIR filter design using rectangular window.

17. How the transition length of FIR filter can be reduced in design using windows ?

18. Why gibbs oscillations are developed in rectangular window and how can it be reduced or eliminated?

19. List the characteristics of FIR filter designed using windows.

20. Write the frequency response of hanning window.

21. Write the frequency response of hamming window.

22. Write the equation of hanning window function

23. List the features of hanning window spectrum.

24. Compare rectangular window with hanning window

25. Write the equation of hamming window function.

26. Sketch the log-magnitude spectrum of Hamming window.

27. List the features of hamming window spectrum.

28. Compare rectangular window with hamming window

29. Compare hanning window with hamming window

30. List the features of blackman window spectrum.

31. Compare blackman window with hamming window

32. Write the expression for kaiser window function

33. List the features of kaiser window spectrum.

34. Compare kaiser window with hamming window

35. Compare IIR filter and FIR filter

36. Define IIR filter

37. What are all the properties that are maintained same in the transformation of analog to digital filters?

38. Mention the properties that an analog filter should have for effective transformation.

39. Condition to be satisfied by linear phase FIR filter

40. In design of FIR filter, How is kaiser window different from other windows?

41. Show that the filter with h(n)={-1,0,1} is a linear phase filter.

42. What is the desirable characteristic of frequency response of window function?

43. Why is linear phase important in digital signal processing applications?

44. List out the well known design techniques for linear phase FIR filter.

45. What are all the disadvantages of FIR filter?

46. What is frequency sampling?

47. For what type of methods frequency sampling is suitable ?

48. What is meant by FIR filter and why is it stable ?

49. Find the number of delays required in a direct form I structure that realizes a second order transfer function?

50. Draw the direct form realization of a system using the given unit sample response.

51. Find the transfer function for a 1st order filter structure.

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