Dsp Questions(2) 52356c

DSP ORAL QUESTION BANK

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( DSP QUESTION BANK FROM ORAL EXAMINATION POINT OF VIEW) 1) : 2) : 3) : 4) : 5) : 6) : . 7) : 8) : 9) :

Define a Signal? Define a System? What is signal processing? Classify? What are the basic elements of Digital Signal Processing? What is analog signal processing? Classify Digital Signal Processing? Advantages of DSP over ASP? What are the disadvantages of DSP? 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?

SINHGAD COLLEGE OF ENGG., COMPUTER ENGG. DEPT

P R Futane.

DSP ORAL QUESTION BANK

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46) : 47) : 48) : 49) : 50) : 51) : 52) :

State the important properties of linear convolution? What is the stability criteria for LTI system? What are the different methods on converting analog data to digital data? Draw basic block diagram of A/D converter? Define “sampling”? Give the relation ship between continuous time variable ‘t’ and discrete time variable ‘n’? 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 of z-transform? 88) : Give the condition for Stability of LTI system in of z-transform? 89) : Explain pole-zero cancellation? 90) : What is Fourier transform? SINHGAD COLLEGE OF ENGG., COMPUTER ENGG. DEPT

P R Futane.

DSP ORAL QUESTION BANK

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91) : 92) : 93) : 94) : 95) :

What is the purpose or need of Fourier transform? What is frequency analysis or spectral analysis? What is Spectral Estimation? List the different Fourier Representations? Write the equation for Fourier Transform pair for discrete time signals? 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 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 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 deg a filter which are the factors that you take into considerations. 124) : What is cut off frequency, stop band freq, band freq and so on. 125) : Whether you prefer analog filter deg or digital filter deg 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? SINHGAD COLLEGE OF ENGG., COMPUTER ENGG. DEPT

P R Futane.

DSP ORAL QUESTION BANK

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Which addresses are generated by DAG1 and DAG2? What is the function of Bus exchange block in ADSP21XX? What are the inputs and outputs of ALU? Which status signals are generated by ALU? What is the function of Barrel shifter? Which are the three s in DAGs? Do DSP processors have on chip data and program memories? Which operations are performed by program sequencer? Name the status s in program sequencer? What is MIPS? What is its value for ADSP 2100 processor? How many external interrupts are available for ADSP210 processor? Name the associated with Timer? What is system builder? What is assembler? Which files are generated by assemblers? Which file is generated by system builder? Why many NOP instructions are given at the beginning of the program? What is the function of modify ? Draw the frequency spectrum for showing aliasing effects. What is the major role of ROC. Standard signals analysis in various domains. Need of shifting from one domain to another. Certain questions on MATLAB package & its functions

SINHGAD COLLEGE OF ENGG., COMPUTER ENGG. DEPT

P R Futane.