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**DSP QUESTION BANK FROM ORAL EXAMINATION POINT OF VIEW**

**)**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 signalprocessing?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 practicallyachievable? 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 system42) : 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 timeindependent 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’ samplinginterval ‘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 frequencyvariables 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 themagnitude 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 frequencycomponents?114) : What are the applications of DSP?115) : Specify the role of DSP concept you have studied in certain applications116) : Draw the architecture diagram for ADSP-21xx family.117) : Role of each individual unit in DSP processor.118) : Comparison of DSP processor with normal microprocessor119) : Which are the different companies associated with DSP processor. Name those companies alongwith their processor series.120) : Give the practical example of signals121) : What do you understand from realiziability of a filter122) : 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 on126):- 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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question should be unitwise..........

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