snehaworld: DSP IMPORTANT QUESTIONS

UNIT-1

1..Define periodic signal and illustrate problems ?
2 Find the step response of a discrete-time LTI system whose difference equation is given by

y(n)=y(n-1)+0.5y(n-2)+x(n)+x(n-1)

3. Define and explain the following systems with an example: (i) Causual and non-causual (ii) Time-invarient and time-varient
4. Find the magnitude and phase response of the LTI system with

h(n)=x(n)-x(n-1)

5. Determine the causality and stability of the following systems with impulse response (i). h(n)=3ⁿu(-n) (ii). E²ⁿu(n-1)
6. Define and explain the following discrete-time signals with necessary mathematical expressions :(i) periodic and aperiodic (ii) Energy and power
7. State and prove the frequency shifting property of DTFT.
8. Explain the digital signal processing &block diagram and classify their signals?
9. Discuss the frequency domain representation of linear time-in variant systems?
10.Determine the all systems with illustrate problems ?

UNIT-2

11Find the DFT of the following sequence using DIF FFT x(n)={1,2,3,5,5,3,2,1}
12. Find the inverse FFT of x[k]=[10,-2+j2,4,-2-2j]
13.Compute the DFTS of the sequence x(n)=2^-n where N=8 using DIT algorithm ?
14. State and prove any four properties of discrete fourier series (DFS) ?
15. Explain the significance of FFT algorithms. Draw the basic butterfly diagram for radix-2 DIT FFT ?
16. Find the linear convolution of the sequence x(n)={1,4,0,9,5} and h(n)={-3,-4,5,6,8} and related problems
17.State and prove the convolution properties of DFT ?
18. How FFT algorithm improves the speed of computation? Explain with an example ?
19. Find the 4-point DFT of the sequence x(n)={2,1,3,4} by using DIF FFT algorithm ? also, plot its magnitude and phase spectra ?
20. Explain the procedure to compute 8-point DFT using DIT FFT algorithm ?
21. Distinguish between linear convolution and circular convolution ?
22. Develop a radix-2 DIT FFT algorithm for evaluating 4-point DFT . also draw its flow diagram ?

UNIT-3

23. Explain Transposed Forms ?
24.Obtain the direct form I and direct form II and cascade form realization of the following system functions
y(n)=0.1y(n-1)+0.2y(n-2)+3x(n)+3.6x(n-1)+0.6x(n-2) model problems ?

25.Obtain the parallel form realization for the IIR system described by the transfer function

H(z)=3+3.6z^-1+0.6z^-3/1+0.1z^-1-0.2z^-2

26. Realize H(z)=1+0.6z^-2+0.2z^-1/3+5z^-1+4z^-2 using Direct form I and Direct form II structures
27. Compare Chebyshev filter and Butterworth filter
28.Obtain the cascade form realization for the recursive IIR system described by the transfer function H(z)=3+3.6z^-1+0.6z^-2/1+0.1z^-1-0.2z^-2
29.Explain the analog filter to Digital filter?
30. Obtain the 4^th order transfer function of normalized Butterworth low pass filter ?
31.List out the requriements for conversion of stable analog filter into stable digital response ?
32. Find H(z),for a 3^rd order Butterworth filter using impulse invariant transformation method . Assume T=1 sec .

UNIT-4

33. Explain FIR filter design using windowing method
34. Comparision of IIR & FIR filters ?
35. Explain the need for the use of window sequence in the design FIR filter. Describe the window sequence generally used and comparable properties ?
36.Write the characteristics of FIR Digital filters ?
37.Explain about the basic structure of FIR system ?

38.Design of FIR Digital filters using window technique and frequency sampling tech wave?

UNIT-5

39.Explain different pipeline programming models that are adapted in DSP processor ?
40.Explain the cortex-M3 and cortex-M4 processors architecture and draw their block diagram ?
41. Explain memory access schemes in DSPs ?
42. Explain the memory interface block diagram for the TMS320C5X processor ?
43.What are the various addressing modes used in the TMS320C5X processor ?
44. With examples explain the different addressing formats supported by DSP processor for various signal processing applications ?
45.Explain the following i) on-chip peripherals ii)VLIW architecture iii) special addressing modes

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