PTU B.Tech Automation Robotics ECE-EIE 6th Semester May 2019 58034 DIGITAL SIGNAL PROCESSING Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 6th Semester Automation Robotics ECE-EIE

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EIE) (2011 Onwards) (Sem.?6)
DIGITAL SIGNAL PROCESSING
Subject Code : EC-310
M.Code : 58034
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.

SECTION-A
Q1.
Answer briefly :

a) What do you mean by the terms : signal and signal processing?

b) Differentiate between a digital signal processor and a microprocessor?

c) How the aliasing is avoided in digital signal processing?

d) Differentiate between a static and a dynamic system?

e) Sketch the signal u(?n + 4).u(n).

f) What is the floating point concept in DSP?

g) Distinguish between the Fourier series and Fourier transform.

h) What is frequency wrapping?

i) Explain Parseval's theorem.
2 t

2 t


j) Determine the periodicity of the signal x(t) 4sin
5sin


7
9
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SECTION-B
Q2.
A system has an impulse response h(n) = ?0.25(n + 1) + 0.5(n) ? 0.25(n ? 1)

(a) Is the system BIBO stable?

(b) Is the system causal? Justify your answer.
1
Q3.
Find the inverse z-transform of X(z)
if ROC is | z | > 0.6

1

1
1 0.8z 0.12z
Q4.
A causal system is presented by the following difference equation :
1
1
y(n)
y (n 1) x(n)
x(n 1)
4
2

Find the impulse response of the system

Q5.
Compute the DFT of the sequence x(n) = {0,1,2,3}.

Q6.
Compare the characteristics of the various types of analog filters.


SECTION-C
Q7.
Find the direct form-I and form-II realization for the system described by the difference
equation
y(n) = x(n) + 0.5x(n ? 1) + 0.4x(n ? 2) ? 0.6y(n ? 1) ? 0.7y(n ? 2)
Q8.
Design a linear phase low pass FIR filter with 7 taps and a cut off frequency of 0.3
radians using frequency sampling method.
Q9.
(a) Add +410 and +0.37510 by floating point addition. Choose 10 bit floating point format
with 7-bits for mantissa and 3 bits for exponent.

(b) Explain the generic architecture of a digital signal processor.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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