Question Paper Code : 50965
B.E./B.Tech. DEGREE EXAMINATIONS, APRIL/MAY 2024.
Fourth/Fifth Semester
Electronics and Communication Engineering
EC 3492 — DIGITAL SIGNAL PROCESSING
(Common to : Computer and Communication Engineering/Electronics and Telecommunication Engineering/Medical Electronics)
(Regulations 2021)
Answer ALL questions.
PART A — (10 × 2 = 20 marks)
- 1.
State sampling theorem.
- 2.
What is meant by bit reversal and in place computation as applied to FFT?
- 3.
What are the requirements for converting a stable analog filter into a stable digital filter?
- 4.
By Impulse Invariant method, obtain the digital filter transfer function and differential equation of the analog filter H(s) = 1/(s + 1).
- 5.
What are the advantages of FIR filters?
- 6.
What is the condition for linear phase of a digital filter?
- 7.
What are the errors that arise due to truncation in floating point numbers?
- 8.
What do you mean by limit cycle oscillations in digital filter?
- 9.
Define multi sampling rate.
- 10.
What is the use of adaptive filters?
PART B — (5 × 13 = 65 marks)
- 11.(a)
Draw radix 4 butterfly structure for (DIT) FFT algorithm.
- Or
- (b)
Two finite duration sequence are given by x(n) = sin(n pi/2) for n = 0,1,2,3 h(n) = 2n for n = 0,1,2,3. Determine circular convolution using DFT & IDFT method.
- 12.(a)
Distinguish between FIR and IIR filters.
- Or
- (b)
Discuss the properties of Butterworth filter and Chebyshev filter.
- 13.(a)
Discuss in detail about FIR filter design using windows.
- Or
- (b)
Explain Finite word length effects in FIR filters.
- 14.(a)
Give the effective of quantization noise in signal processing and also mention input/output quantization.
- Or
- (b)
Write in detail about Finite word length effects.
- 15.(a)
Discuss the sampling rate conversion by rational factor.
- Or
- (b)
Explain in detail about DSP architecture.
PART C — (1 × 15 = 15 marks)
- 16.(a)
Draw and explain FIR filter structure.
- Or
- (b)
Explain Direct form structures for IIR systems.