Wednesday, October 28, 2009
DIGITAL SIGNAL PROCESSING |
PART A – (10 X 2 = 20 marks) |
1. State Sampling Theorem? |
2. Find the Poles of the system. |
3. Find the DFT of the sequence x(n) ={1, 1, 0, 0 } DFT is obtained by FFT. |
4. Calculate the number of multiplications needed in the calculation of 512 point |
radix2FFT when compared to Direct DFT? |
5. What are the properties that are maintained same in the transfer of analog filter into |
adigital filter? |
6. What is warping effect? |
7.Draw the direct from realization of FIR system? |
8.What are the describe features of a window function? Name the different types |
ofwindowing function? |
9. What is truncation? |
10. Draw a sample/ hold circuit and explain its operations? |
PART B – (5 X 16 = 80 marks) |
11. (a) (i) For each of the following discrete time system, determine whether or not |
thesystem is Linear Time, Variant, Causal and Stable? |
11.(a) (ii) Determine the transfer function, magnitude & phase response, impulseresponse |
for the system. |
11. (b) (i) Find the Ztransformof1) x(n) = 2 n u (n2)2) x(n) = n 2 u (n) |
11.(b)(ii) Use convolution to find x(n), given |
11.(b) (iii) Determine the cross correlation values of the sequence x1(n) ={ 1, 2, 3, 4 |
}x2(n) = {4, 3, 2, 1}12. (a) (i) Compute linear and circular convolution of the two |
sequencex1(n) ={ 1, 2, 2, 2 } and x2(n) = {1, 2, 3, 4} |
12.(a) (ii) Compute the FFT using DIT algorithm for the sequence x(n) = {1, 2, 3, 4, 4, 3,2, |
1 } and draw the corresponding flow diagram. |
12.(b) (i)Prove that multiplication DFT’s of 2 sequence is equivalent to the DFT of |
thecircular convolution of the 2 sequence in time domain? |
12.(b)(ii) Discuss in detail the use of FFT algorithm , in linear filtering? |
13.(a) Find H(z) using impulse invariant technique for the analog system function. |
13 (b) (i) Obtain the direct form II, Cascade form parallel form structures for the system? |
13.(b) (ii) Design a butterworth filter using linear transformation that satisfies |
thefollowing constraint? |
14(a) The desired response of a low pass filter is? |
14.(b) Explain the Type I & Type 2 design of FIR filter using frequency samplingTechnique? |
15.(a) The output of A/D converter is applied to a digital filter withsystem function find |
the o/p noise power for the digital filter when the inputsignal is quantized to 8Hz. |
15.(b)(i) A digital system is characterized by the difference equation y(n)=0.95 |
y(n1)+x(n). Determine the dead band the system when x(n) =0 and y(n) = 1315. |
(b) |
(ii) With neat diagram explain the analysis and synthesis part of a recorder in detail? |