8/10/2019 Signal Oral

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SPL Oral Questions

Signals & System

25. What is LTI system?26. What are the applications of LTI system in DSP?27. State different time Domain and freq. Domain methods of analysis of LTI System28. How does Convolution use properties of LTI systems?29. What is condition of stability of LTI system?30. What does convolution of infinite input sequence indicate?31. What does convolution of impulse input sequence indicate?32. What is Zero State response?33. What is Zero input response?34. How can you decide whether system is Non-linear by Difference equation?

DTFT, DFT, FFT, DIGITAL FILTERS

1. How many complex multiplications, addition is required in DIT FFT algorithmsor in DIF FFT algorithm?2. Is the complexity of both FFT algorithms i.e. DIT FFT and DIF FFT are same?3. How DFT & FFT can be used in image processing?4. State the limitations of DSP.5. How the magnitude and phase is computed in FT, DFT?

6. Specify the steps for circular convolution7. What is in place of computation?8. How will you obtain inverse FT, DFT?9. Which is the other method to compute n point DF. What are T & IDFT?10. Show the steps of matrix method to compute n point DFT.11. Applications of filters.12. What are ideal filter characteristics?13. How will you identify type of filter from placement of poles and zeros?14. Constraints on placement of poles and zeros for filter design.15. What does order of filter signify?16. Define inverse system?17. What is equalizer system?18. Different types of errors occurring in filter?

19. What are different digital filter structures?20. Difference between FIR and IIR filter?21. What is requirement of filter?22. What are different methods to design FIR filters and steps involved?23. Compare different windows?24. Methods to design IIR filter?25. Need of DFT?26. Which are different types of analog filters?27. State DFT expression?28. Significance of n, k?29. Application of DFT as filter?30. Other application of DFT?31. Properties of DFT?

32. Which two approaches are used to computer DFT in efficient manner?33. How FFT is efficient in compute on of DFT?34. Application of FFT in linear filtering?35. Other application of FFT?36. Properties of FFT and Z-Transform

Z-Transform

1. What are advantages of Z-Transform?2. Define ROC and explain its significance.

8/10/2019 Signal Oral

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3. Mention the ROC of all finite and infinite duration sequences.4. Explain linearity property of Z-Transform.5. Explain significance of scaling property.6. Explain significance of time reversal property.7. What is significance of convolution in Z-Domain?8. State initial value theorem.9. Write properties of Z-Transform.10. What are different methods to calculate IZT?11. What is the limitation of power series expansion method?12. How will you calculate IZT using partial fraction expansion?13. Explain conditions for Stability and Causality in Z-Domain.14. What is the relationship between FT and ZT?15. What is the relationship between DFT and ZT?35. Solution of difference equation by Z-Transform?36. Basic steps in converting a signal from analog to digital?37. What will be representation of DTS in freq. Domain?38. What is unilateral and bilateral Z-Transform?39. What does unit circle signify?40. Conclusions from poles and zeros of Z-Transform.41. How parallel realizations differ from cascade realization?42. What is linear transform and why is it used?43. What id digital filter? State the advantages and disadvantages.44. What is actual purpose of digital filter design?

DSP Processors and Applications

1. How the digital processor differs from general purpose microprocessor?2. Name the digital processors you know.3. Discuss the features of DSP Processor.4. Discuss the architectural features of some DSP processors.5. How can DSP be used in speech recognition?6. What do you mean by DSP?7. How DSP is advantageous over ASP?8. Discuss the basic elements of DSP.9. State the various applications where DSP is used in speech recognition.10. Applications of ASP?