Download PTU B-Tech ECE 2020 Dec 5th Sem 70546 Digital Signal Processing Question Paper

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Roll No. Total No. of Pages : 02
Total No. of Questions : 18

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B.Tech. (ECE) (2012 to 2017) (Sem.-5)
DIGITAL SIGNAL PROCESSING
Subject Code : BTEC-502
M.Code : 70546
Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.

SECTION-A

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Write briefly :

1. Verify whether the given system is linear or non-linear y (n) = cos x(n).
2. What is the difference between convolution and correlation?
3. Give the significance of ROC in Z-transform.
4. What do you mean by truncation and rounding errors?

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5. What do you mean by circular shift of a sequence?
6. What do you mean ‘Twiddle Factor’ of DFT & show how it is cyclic?
7. Differentiate between FIR and IIR filter.
8. What is frequency warping effect?
9. What is the significance of barrel shifter?

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10. Write any two features of DSP processor.

SECTION-B

11. Explain different types of discrete time systems with examples.
12. Compute the linear convolution of the given sequences :
    x(n)=[1,2,4]
    

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    h(n):{1 for -1<n<1
    2 for n=2
13. Obtain inverse Z-transform of
    X(Z) = (1 - 1/2 Z^-1) / (1 - 1/4 Z^-2)
14. Determine the Z-transform and sketch the ROC of :
    

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    x (n) = cos (w₀n) u (n)
15. Determine the direct form-I and direct form-II structure for the system described by the system function
    H(z) = (1-0.8z^-1 +0.15z^-2) / (1+0.1z^-1 - 0.72z^-2)

SECTION-C

16. With the help of N = 8, explain radix-2 decimation-in-time (DIT) FFT algorithm for computation of DFT.

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17. Explain in detail design methodologies impulse invariance and bilinear transformation for the design of IIR filter.
18. The desired frequency response of a symmetric FIR filter is
    H(?) = { 1, |?| < p/6
    0, p/6 < |?| < p }
    Stopband attenuation is > 40 dB
    

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    Determine the frequency response H(?) using window method.

NOTE : Disclosure of identity by writing mobile number or making passing request on any page of Answer sheet will lead to UMC case against the Student.

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