M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Electronic Science
DIGITAL SIGNAL PROCESSING
Time 2½ Hours
Max. Marks: 70
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
A)Select the correct alternatives:-
08
Signal with is called energy signal.
zero
infinite
finite
static
A discrete time signal is said to be even when




For 8-point DFT, there are stages.
1
4
3
8
Z transform is a operator.
Linear
Complex
Integral
Differential
If for then its z-transform
z2+ z3
z2- z3
z-3
z-3
If is a input to z-1 building block, its output is




SFG form is called as
Transmittance form
Admittance form
Transposed form
Sampling form
IIR digital filter is a
Recursive filter
non-recursive filter
quantized filter
band-limited filter
Q.1
B)State true and false:
06
S1=Aejωt is an example of complex valued signal.
A delay of signal is represented as if k is +ve.
Z-transform may be viewed as the DTFT.
The DFT provides a convenient way to perform convolution.
In DIF-FFT, output is in natural order.
Direct form-II realization is obtained by combining two transfer functions.

Q.2Give a brief account on
14
A)Quantization
B)Properties of Z-transform
C)Cascade form of IIR
Q.3
A)If draw a neat labeled discrete time signal diagram for

ii)
iii)
iv)
10
B)Perform circular shift operation on to obtain as:

ii)
04
Q.4
A)Describe the DIF-FFT algorithm.
10
B)What is radix-2 DIT algorithm?
04
Q.5
A)For a given sequence and elsewhere. Find the DFT for the first four points.
10
B)Find the IDFT using DIF method for the above
04
Q.6
A)Distinguish between IIR and FIR digital filters.
10
B)Obtain a parallel form of IIR system given by a system function and
04
Q.7
A)Give a brief note on notch and comb filter.
10
B)Consider a system function (1-0.75z-1). Draw a SFG 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.