M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Electronic Science
DIGITAL SIGNAL PROCESSING
Day Date: Thursday, 16-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Q.1 and Q.2 are compulsory.
Attempt any three questions from Q. 3 to Q.7.
All questions carry equal marks.
Use of nonprogrammable calculator is allowed.
Q.1 Select the correct alternatives:- 08
S1=A Sin is a
Single variable signal Real valued signal
Complex valued signal Multichannel signal
Output of causal system depends upon only
Present inputs Past inputs
Present and past input Future inputs
Z-transform may be viewed as
Discrete Laplace transform Discrete Fourier transform
Discrete Time Fourier transform Discrete Threshold transform
DFT provides a convenient way to evaluate
Convolution Convolution sum
Convolution product Deconvolution
In DIT-FFT
Multiplication is done after addition
Multiplication is done before addition
Multiplication is done after linear filtering
Multiplication is done before linear filtering
Canonical realization is
Direct form-I realization Direct form-II realization
Cascade form Parallel form
Selection of digital filter depends on
Time domain Phase domain
Frequency domain Quantized domain
Digital parameters are obtained in
plane plane
X-Y plane plane
Q.1 State true and false 06
A linear system satisfies superposition principle.
Discrete time system is linear and time invariant.
Z-transform of sequence is equal to 1.
All zero system has a Finite Impulse Response.
The system function remains unchanged even after interchange of
input and output in SFG.
A comb filter can be viewed as a notch filter.
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SLR-MH-330
Q.2 Give a brief account 14
Advantages of DSP over ASP.
Properties of DFT
Notch Filter
Q.3 How will you manipulate a discrete time signal by various transformation
operations? Explain with suitable examples.
10
If draw a eat diagram of discrete time for
ii) iii)
04
Q.4 The impulse response of LTI system is Determine the
convolution response of a system to the input signal
08
With the help of basic building blocks, draw a disrete time system for the
following I-O relations.
06
1
4 1
2 1 − 1
4 −
1
2 1 − 1
3
Q.5 Consider the causal linear shift invariant filter with system function:-
− Draw a Signal
Flow Graph for the system using:-
Direct form-I,
ii) Direct form-II, and
iii) a cascade of 1st and 2nd order systems realized in direct form-II.
10
What is casuality and stability of a system? 04
Q.6 Obtain an expression for N/2-point DFT using decimation in Time-FFT
algorithm. How computation is involved in an eight point sequence. Explain
with figure.
10
Write note on windowing method of design of a digital filter. 04
Q.7 What are the specifications for filter design? Mention requirements for FIR
filter design.
10
Mention the applications of Notch and Comb filter. 04