DSP Question Bank oral point of view

( DSP QUESTION BANK FROM ORAL EXAMINATION POINT OF VIEW)

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1) : Define a Signal?

2) : Define a System?

3) : What is signal processing? Classify?

4) : What are the basic elements of Digital Signal Processing?

5) : What is analog signal processing?

6) : Classify Digital Signal Processing?

. 7) : Advantages of DSP over ASP?

8) : What are the disadvantages of DSP?

9) : State the factors which decide whether to use analog approach or digital approach in signal

processing?

10) : Classification of signals?

11) : Give an example of a signal which is Multi channel as well as Multidimensional signal?

12) : What are the notations used to denote “Continuous-time” and “Discrete-Time” signals.

13) : How to obtain Discrete-Time signals?

14) : Define Digital Signal and Analog signals?

15) : If random signals cannot be described by a mathematical formula how are they analyzed?

16) : Is it possible to analyze a digital signal off-line in a laboratory? Justify?

17) : List the different ways of representing Discrete-Time signal?

18) : What are Standard Test Signals (Sequences)?

19) : Classification of discrete-time signals?

20) : Define the fundamental period for discrete time signal x (n)?

21) : Give examples of periodic signals encountered in practice?

22) : What is the criteria for a signal to be referred to as an “energy signal”?

23) : What is the criteria for a signal to be referred to as an “power signal”?

24) : Which of these signals are “energy” or “power signals”?

25) : How much energy does a “power signal” have and how much “power” does an “energy signal”

have?

26) : Explain the different operations performed on signals?

27) : In real-time signal processing applications are the shifting operations on a signal practically

achievable? Justify?

28) : Are folding and shifting (time-delay or time advance) operations commutative?

29) : Define a system? Broadly classify the systems?

30) : Define discrete-time system?

31) : Why “static system” is called “memoryless” system?

32) : What are the steps to test the shift (time) invariance property?

33) : What are the steps to test the linearity property?

34) : Is a non-causal system physically realizable? Justify?

35) : How to check if the system is stable or unstable?

36) : What is an “invertible” system?

37) : Write a short note on “Block diagram representation of discrete-time system?

38) : Does unit delay block require memory?

39) : Represent a continuous-time signal and discrete-time signal mathematically?

40) : What is LTI or LSI system?

41) : Which Tools are used for analysis of LTI system

42) : What is linear convolution?

43) : In the formula for convolution sum what does h (n) denote?

44) : What are the various operations involved in computation of Linear Convolution?

45) : What are the different methods of computing linear convolution?

46) : State the important properties of linear convolution?

47) : What is the stability criteria for LTI system?

48) : What are the different methods on converting analog data to digital data?

49) : Draw basic block diagram of A/D converter?

50) : Define “sampling”?

51) : Give the relation ship between continuous time variable ‘t’ and discrete time variable ‘n’?

52) : Give the relation ship between continuous time independent variable and discrete time

independent variable?

53) : Define “sampling period” or “sampling interval” or “sampling time”?

Define “sampling rate” or “sampling frequency”?

54) : Give the relation between sampling interval and sampling frequency?

55) : Give the relationship between continuous time variable‘t’, discrete time variable ‘n’ sampling

interval ‘T _s’ and sampling frequency ‘F _s’

55) : Give the notations for continuous time frequency and discrete time frequency?

56) : Summarize the continuous time and discrete time frequency relationships?

57) : What is the frequency criterion to represent an analog signal by a discrete time signal?

58) : Explain the concept of “aliasing”?

59) : Show the relationship between the continuous-time frequency and discrete time frequency

variables graphically?

60) : Define “sampling theorem”?

61) : Explain quantization?

62) : Classify LTI system on the basis of impulse response h (n)?

63) : Define FIR and IIR systems?

64) : Does FIR system have finite or limited memory requirement?

65) : Does IIR system have finite or limited memory requirement?

66) : Is practical implementation of IIR system using linear convolution possible? Justify?

67) : Why FIR systems can be implemented and IIR systems cannot be using convolution formula?

68) : Classify discrete-time system on the basis of output produced by the system?

69) : Explain why Causal LTI FIR systems are Non-Recursive systems?

70) : Can a Causal IIR system be implemented in Non-recursive form?

71) : Give the generalized form of linear constant coefficient Difference Equation?

72) : What is Z transform?

73) : Give the different representations of Z Transform?

74) : What is complex z-plane?

75) : What is ROC?

76) : Plot the following Region of Convergence in complex z-plane?

77) : How to determine the causality property of a signal using Region of Convergence?

78) : What is “Double Sided z-transform” and “One-Sided z-transform”?

79) : State the properties of z-transform?

80) : How will you compute the convolution of two signals x ₁(n) and x ₂(n) using z-transform?

81) : Define Inverse Z-Transform? What is the use of inverse Z-Transform?

82) : What is “Rational Z-Transform?

83) : Define Poles and Zeros? Give their graphical notations?

84) : Define “gain” of z-transform?

85) : Explain the term H (z)?

86) : Give the equation for System Function of LTI system?

87) : Give the condition for Causality of LTI system in terms of z-transform?

88) : Give the condition for Stability of LTI system in terms of z-transform?

89) : Explain pole-zero cancellation?

90) : What is Fourier transform?

91) : What is the purpose or need of Fourier transform?

92) : What is frequency analysis or spectral analysis? What is Spectral Estimation?

93) : List the different Fourier Representations?

94) : Write the equation for Fourier Transform pair for discrete time signals?

95) : What is the difference between Fourier Transform of discrete time signal and continuous time (i.e.

analog) signal?

96) : Give the condition for the existence of discrete-time Fourier Transform?

97) : List the properties of Discrete-Time Fourier Transform?

98) : Explain the term H (ω)?Explain the term “Transfer Function”?

99) : Explain the term “Frequency Response” of the system?

100) : Comment on the magnitude and phase plots of H (ω)?

101) : Give the notations for magnitude and phase response of H (ω) and then comment on the

magnitude and phase plots of the frequency response of a discrete-time LTI system?

102) : What is Discrete Fourier Transform (DFT)?

103) : How is the formula For DFT developed?

104) : Give the equation for Inverse Discrete Fourier Transform (IDFT)?

105) : Is there any relation to compute ‘N’?

106) : Compare Fourier Transform and Discrete Fourier Transform?

107) : Compare DTFT and DFT?

108) : What is called “padding the zeros” or “stuffing the zeros”?

109) : In the process of zero padding why only zero is used and not any other number?

110) : What is “Twiddle factor? What is its use?

111) : Write equations for DFT and IDFT in terms of Twiddle factor and in vector form?

112) : State the properties of DFT?

113) : Give equation for energy in finite-duration sequence x (n) in terms of the frequency

components?

114) : What are the applications of DSP?

115) : Specify the role of DSP concept you have studied in certain applications

116) : Draw the architecture diagram for ADSP-21xx family.

117) : Role of each individual unit in DSP processor.

118) : Comparison of DSP processor with normal microprocessor

119) : Which are the different companies associated with DSP processor. Name those companies along

with their processor series.

120) : Give the practical example of signals

121) : What do you understand from realiziability of a filter

122) : What are the ideal characteristics of a filter.

123) : While designing a filter which are the factors that you take into considerations.

124) : What is cut off frequency, stop band freq, band pass freq and so on.

125) : Whether you prefer analog filter designing or digital filter designing and why.

126) : What are LPF, HPF, BPF and so on

126):- Whether DSP processor is a microprocessor ?

127):- How DSP processor is different from general purpose processors ?

128):- Which are the commonly used DSP processors ?

129):- In which applications DSP processor are used ?

130):- Can you quote any examples that use DSP processor ?

131):- Which are the different architectures for microprocessors ?

132):- Which architecture is used for DSP processors?

133):- What is data memory and program memory ?

134):- What is the advantage of separate data and program memory?

135):- What is DAG in ADSP21XX processors?

136):- Which addresses are generated by DAG1 and DAG2?

137):- What is the function of Bus exchange block in ADSP21XX?

138):- What are the inputs and outputs of ALU?

139):- Which status signals are generated by ALU?

140):- What is the function of Barrel shifter?

141):- Which are the three registers in DAGs?

142):- Do DSP processors have on chip data and program memories?

143):- Which operations are performed by program sequencer?

144):- Name the status registers in program sequencer?

145):- What is MIPS? What is its value for ADSP 2100 processor?

146):- How many external interrupts are available for ADSP210 processor?

147):- Name the register associated with Timer?

148):- What is system builder?

149):- What is assembler?

150):- Which files are generated by assemblers?

151);- Which file is generated by system builder?

152):- Why many NOP instructions are given at the beginning of the program?

153):- What is the function of modify register?

154) : Draw the frequency spectrum for showing aliasing effects.

155) : What is the major role of ROC.

156) : Standard signals analysis in various domains.

157) : Need of shifting from one domain to another.

158):- Certain questions on MATLAB package & its functions

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