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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