JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year DIGITAL SIGNAL PROCESSING Previous Question Paper (November/December - 2018 - R15)
Part A is compulsory. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
What is the advantage of direct form II realization when compared to direct form I realization?
Answer
The primary advantage of Direct Form II over Direct Form I is that it requires fewer memory elements (delays). Direct Form II uses a single set of delay elements for both the feed-forward and feedback paths, effectively reducing the memory requirement by half for a given filter order.
What are the advantages and disadvantages of direct – form realization?
Answer
Advantages: They are simple to design and implement, providing a direct mapping from the difference equation to the hardware structure. Disadvantages: They are highly sensitive to finite word-length effects, such as coefficient quantization and round-off noise, and they lack modularity for high-order filters.
How many multiplications and additions are required to compute N-point DFT using radix-2 FFT?
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Differentiate Decimation-in-time and Decimation-in-frequency.
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Draw the direct form structure of IIR filter.
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List different TTR filter design techniques.
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State the properties of FIR filter.
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Compare Rectangular window and Hamming window.
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What is Multi-rate signal processing?
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Explain the term Limit cycle oscillator.
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Part B
Explain the following with example:
a) Causal and non-causal
b) Stable and unstable.
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Explain the frequency response of Stable systems.
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Explain the realization of digital filter using cascade form.
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Explain 8-point decimation in time FFT algorithm.
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Explain the properties of DFT.
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Explain Radix-2 DIF-FFT algorithm.
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Derive bilinear transformation mapping formula for designing IIR digital filter.
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Explain in detail butterworth filter approximations.
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Design an ideal differentiator with frequency response, H(ejw) = jw; -π ≤ w ≤ π using hamming window with N = 8.
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Explain, how the zeros in FIR filter is located.
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Explain the frequency response of FIR digital filter.
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Explain, how to prevent Limit Cycle oscillations?
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Explain the limit cycle oscillations due to product round off and over flow error.
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