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

Roll No. :

Total No. of Pages : 02

Total No. of Questions : 09

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B.Tech.(?) (2011 Onwards) (Sem.-6)

DIGITAL SIGNAL PROCESSING

Subject Code: EC-310

M.Code: 58034

Time: 3 Hrs.

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Max. Marks : 60

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.

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SECTION-A

Q1. Answer briefly :

1. What do you mean by the terms : signal and signal processing?
2. Differentiate between a digital signal processor and a microprocessor?
3. How is aliasing avoided in digital signal processing?

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4. Differentiate between a static and a dynamic system?
5. Sketch the signal u(–n + 4).u(n).
6. What is the floating point concept in DSP?
7. Distinguish between the Fourier series and Fourier transform.
8. What is frequency wrapping?

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9. Explain Parseval's theorem.
10. Determine the periodicity of the signal x(t)=4sin(2pt/7)+5sin(2pt/9)

SECTION-B

Q2. A system has an impulse response h(n) = -0.25d(n + 1) + 0.5d(n) – 0.25d(n - 1)

1. Is the system BIBO stable?

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2. Is the system causal? Justify your answer.

Q3. Find the inverse z-transform of X(z) = 1/(1-0.8z¯¹ +0.12z-¹) if ROC is | z | > 0.6

Q4. A causal system is presented by the following difference equation : y(n)+(1/4)y(n-1) = x(n)+(1/2)x(n-1) 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.

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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 0.3p 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.

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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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