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Code No: D7507, D5409

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD M.Tech II SEMESTER EXAMINATIONS, APRIL/MAY-2013

ADVANCED DIGITAL SIGNAL PROCESSING (COMMON TO CONTROL SYSTEMS, POWER ELECTRONICS AND

ELECTRIC DRIVES) Time: 3hours Max.Marks:60

Answer any five questions All questions carry equal marks

- - - 1.a) Realize the following system using Ladder structure realization.

b) Discuss the computational complexity and hardware requirement of digital filter

structures.

2.a) Explain the necessity of approximations in the design of an IIR filter. b) Design a first order, unit Band width 3dB digital Butterworth Filter using Bilinear Transformation.

3. An FIR low pass filter is to be designed with the following desired frequency

response:

= 0 for Find the filter coefficients if the window used is a rectangular window defined as W(n) =1 for 0≤n≤4 = 0 otherwise. 4.a) Discuss in detail about various cases of frequency response of FIR filters. b) Write a short note on spectral transformations in case of IIR filters. 5.a) Define overflow error and discuss the remedies to overcome it.

b) Discuss in detail about the errors that occur due to finite word length representation of digital data.

6.a) Derive the expression for the Mean square value of round off error, that is

resulting in the process of quantization. b) Write about Limit cycle oscillations. 7.a) Discuss the estimation of power spectra of given signal using periodogram and

what are its limitations. b) Find the Autocorrelation and Power spectral density of the signal

x(t)=K.Cos(2πfct+Ф), where K and fc are constants and Ф is a uniform random variable (-π, π).

8.a) Compare parametric and Non-parametric methods of power spectrum estimation.

b) Discuss in detail, how Welch improved the spectral characteristics of a signal compared to Bartlett method.

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