Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EE 7th Sem 71938 Digital Signal Processing Previous Question Paper

Total No. of Pages : 02

Total No. of Questions : 18

B.Tech. (EE) (2011 Onwards Elective-II) (Sem.?7)

DIGITAL SIGNAL PROCESSING

Subject Code : BTEE-804C

M.Code : 71938

Time : 3 Hrs. Max. Marks : 60

INST RUCT IONS T O CANDIDAT ES :

1 .

SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks

each.

2 .

SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents

have to atte mpt any FOUR q ues tions.

3 .

SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents

have to atte mpt any T WO questio ns.

SECTION-A

Write briefly :

1.

What is an Energy and Power signal?

2.

Define recursive and non-recursive system.

3.

Determine the fundamental period of the signal.

30n

x (n) cos

105

4.

Check for following system is stable or unstable.

1

y (n) x

2n

5.

State the convolution property of Fourier Transform.

6.

What is ROC in Z-Transform?

7.

State the time reversal property of Z-transform.

8.

Why the result of circular and linear convolution is not same?

9.

What are the various methods to design IIR filters?

10. Write the steps involved in FIR filter design.

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SECTION-B

11. Explain the classification of discrete systems.

12. Find the Z-transform and sketch the ROC :

x (n) = an cos 0 nu (n)

13. Obtain inverse Z-transform of :

1

1

1

z

2

X (Z )

| z | 1 / 2

1

2

1

z

4

14. Compute the Fourier Transform of x(n) = 2nu(n).

15. Determine the length-4 sequence from its DFT :

X(K) = [2, l ? j, 0, l + j]

SECTION-C

16. The system function of analog filter is as given

s 0.1

H (S )

a

2

(s 0.1) 9

17. Design a FIR low pass filter using Kaiser Window having following specifications :

Pass-band cut-off frequency = 150 Hz

Stopband cut-off frequency = 250 Hz

Passband ripple = 0.1 dB

Stopband attenuation = 40 dB

Sampling frequency = 1000 Hz

18. a) State and prove convolution property of DFT.

b) Determine the length-4 sequence from its DFT

X(K) = [2, 1 ? j, 0, 1 + j]

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 26 June 2021