1. Write a short notes on Time and Frequency domain input-output
relationship of an LTI system. (Dec 2013).2. An LTI system is
characterized by its impulse response h(n) = (1/2)n u(n). Determine
the spectrum and energy density spectrum of the output signal when
the system is excited by the signal x(n) =(1/4)n u(n). (Dec
2013).3. Discuss the procedure of computing linear convolution
using Over-lap add method. (Dec 2013).4. Perform linear convolution
of the two sequences x(n) = {1, 2, 3, -1, 2,-3,4,5,6} and
h(n)={2,1,-1} using Over-lap add method. (Dec 2013).5. How the
computational speed of FET algorithm has been improved over DFT.
(Dec 2013).6. Give the general procedure of computing FFT using DIF
algorithm and develop the basic butterfly structure and necessary
equations. (Dec 2013).7. Explain briefly the frequency response of
LTI system. (Dec 2013).8. Discuss direct form-I and II IIR
realization structures in detail with necessary flow graphs. (Dec
2013).9. List out the merits and demerits of Butterworth and
Chebyshev filter approximation techniques. (Dec 2013, May 2012).10.
Prove that the relationship between analog () and digital ()
frequency in bilinear transformation is given by = (2/T) Tan (/2).
(Dec 2013).11. Compare various windowing techniques with respect to
side lobes and beam width. (Dec 2013).12. Design an FIR digital
high pass filter using of digital systems with different sampling
rates with a neat block diagram. (Dec 2013).13. Discuss the process
of interpolation by a factor I with a neat block diagram. (Dec
2013).14. Explain the process of interfacing of digital systems
with different sampling rates with a neat block diagram. (Dec
2013).15. Discuss quantization errors occurring in the computation
of DFT. (Dec 2013).16. What are limit cycles and explain the types
of it and also give their remedies. (Dec 2013).17. Determine the
impulse and unit step response of the systems described by the
following difference equation. y(n) = 0.6Y (n-1)-0.008(n-2)+x(n).
(June 2013).18. State and prove circular convolution property of
DFT. (June 2013).19. Perform linear convolution of the two
sequences x(n) ={1,-1,2,-2,3,-3,4,-4} and h(n)={-1,1} using
over-lap add method. (June 2013).20. How the computational
complexity is reduced in FFT over DFT. (June 2013).21. Find the
four point DFT of the sequence x(n) =(-1)n using DIF-FFT. (June
2013).22. Compare direct form-I and direct form-II structures with
respect to hardware requirements. (June 2013).23. Obtain the
parallel and cascade realization structures for the system function
given by H(Z)=(1+1/4Z-1)/(1+1/2Z-1)(1+1/2Z-1+1/4Z-2). (June
2013).24. What is bilinear transformation and sketch the mapping of
S-plane into Z-plane in bilinear transformation. (June 2013,Dec
2012).25. Explain how to convert an analog filter transfer function
into digital filter transfer function using bilinear
transformation. (June 2013).26. Design an FIR digital high pass
filter using Hamming window whose cutoff frequency is 1.2 rad/s and
length of window N=5. Compare the same using rectangular window
.Draw the frequency response curve for both the cases. (June
2013).27. Discuss the sampling rate conversion by a factor I/D.
(June 2013).28. A sequence x(n) is up sampled by I=2, it passes
through an LTI system H1(Z), and then down sampled by D=2. Can we
replace this process with a single LTI system H2(Z)? If yes,
determine the system function of this system. (June 2013).29.
Discuss the effects due to finite word length in direct form-I and
II structures. (June 2013).30. What is meant by over flow error and
how it can be avoided? (June 2013).31. Derive the necessary and
sufficient condition for the system to be stable and discuss the
importance of stable system. (Dec 2012).32. Define an LTI system
and derive the expression for the output response of an LTI system
whose input sequence is x(n) and impulse function of the system is
h(n). (Dec 2012).33. Define DFT and IDFT and state all properties
of DFT. (Dec 2012).34. Determine the response of the system whose
input x(n) and impulse response h(n) are given by x(n)={1,2} and
h(n)={1,2} using DFT and IDFT. (Dec 2012).35. Discuss Radix-2
algorithm in detail. (Dec 2012).36. Compute 8-point DFT of the
given sequence x(n) ={1,2,1,2,1,2,1,2} using DIF-FFT algorithm.
(Dec 2012).37. What are the various building blocks required in
realization of digital systems. (Dec 2012).38. Discuss parallel and
cascade realization structures and implement them for the transfer
function given by
H(Z)=(0.28Z2+0.319Z+0.04)/(0.5z3+0.3Z2+0.17Z-0.2). (Dec 2012).39.
Discuss the problems encountered in design of digital filter using
impulse invariant and bilinear transformation techniques. (Dec
2012).40. What are the desirable features of the window functions
and explain the effects of it. (Dec 2012).41. Design an FIR digital
band pass filter using hanning window whose upper and lower cut off
frequencies are 4 and 5 rad/s and lengh of window N=9.Realize the
filter using linear phase realization structure. (Dec 2012). 42.
What is meant by multirate signal processing? What are the
applications of it? (Dec 2012).43. Discuss the process of
decimation by a factor D and hence explain how the aliasing effect
can be avoided. (Dec 2012). 44. Define limit cycles and discuss its
types. (Dec 2012).45. Discuss finite word lengh effects of
implementation of FFT algorithm. (Dec 2012).46. Give the
differences between analog and digital system. (May 2012).47. Give
the block diagram of analog signal processing and compare with
digital signal processing system and list out the applications of
each. (May 2012).48. Define DFT and IDFT. Prove circular
convolution, circular correlation and Time reversal properties of
DFT. (May 2012).49. Find the IDFT of the sequence X (K) = {
2,2-3j,4,2+3j }.(May 2012).50. Design a digital Butterworth LPF
using Bilinear transformation technique for the following
specifications 0.07|H(w)|1;0w0.2 |H(w)|0.08;0.4w. (May 2012). 51.
Compare DIT and DIF FFT algorithms. (May 2012).52. Develop the
signal flow graph in computing 16-point FFT using DIT-FFT
algorithm. (May 2012).53. Define phase delay and group delay. (May
2012).54. The following transfer function characterizes an FIR
filter (M=11). Determine the magnitude response and show that the
phase and group delays are constant. H(Z)=-n. (May 2012).55. Define
frequency response, magnitude spectrum, phase spectrum and time
delay. (May 2012).56. Determine the frequency response, magnitude
response and phase response of the second order system.
y(n)+1/2y(n-1)=x(n)-x(n-1). (May 2012).57. Discuss the effect of
ADC Quantization noise on signal quality. (May 2012).58. Discuss
finite word length effects of implementation of FFT algorithm. (May
2012).59. Design a poly phase filter structure for a sequence
x(n)={x(0),x(1),x(2),x(3)} interpolated by a factor 3 and consider
the filter length N=9. (May 2012).60. Explain the process of
performing sub band coding for speech signals. (May 2012).
