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

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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This post was last modified on 04 November 2019